Main Street Dam Feasibility Study

FEASIBILITY STUDY main street dam feasibility study

2 0 1 2

MAIN STREET DAM REMOVAL

ACKNOWLEDGEMENTS COLUMBUS DOWNTOWN DEVELOPMENT CORPORATION Guy Worley, CEO Amy Taylor, COO Milt Lewis, Director of Construction Services

CITY OF COLUMBUS Dax Blake, PE, Administrator, Division of Sewerage and Drainage Mike GrifďŹ th, PE, Division of Sewerage and Drainage Erin Miller, Environmental Steward

STANTEC Bryon Ringley, PE, Principal Scott Peyton, PE, Senior Associate Travis White, PE, SI, Senior Project Engineer Brad Rodgers, PE, CHMM, Senior Associate Cody Fleece, Senior Ecologist Rich Williams, PhD, PE, Senior Geotechnical Engineer Jenny Rytel, PG, Geologist Mary Murphy, Administrative Assistant

MSI DESIGN Keith Myers, FASLA, Principal Darren Meyer, RLA, Associate Principal Andrew Overbeck, AICP, Urban and Regional Planner Aron Fraizer, ASLA, Associate Charles Benick, Project Designer

RESOURCE INTERNATIONAL Michelle Eckels, CPG, Director of Environmental Services Mark Ward, PS, Survey Manager

ASC GROUP Shaune Skinner, President Al Tonetti, Cultural Resource Specialist

COLDWATER CONSULTING Kristen Risch, Senior Restoration Specialist

02

SHELLEY, METZ, BAUMANN, HAWK Jon Beier, PE, LEED AP BD+C

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acknowledgements and table of contents

04

executive summary

06

planning context

08

recent investment

10

river evolution

12

feasibility study

14

natural channel design

16

concept plan

26

implementation

main street dam removal feasibility study

table of contents & acknowledgments

TABLE OF CONTENTS

03

EXECUTIVE SUMMARY RIVERFRONT RENAISSANCE

riverfront and connect the neighborhoods and districts along the

Columbus is in the midst of a riverfront renaissance. Beginning

river corridor.

with North Bank Park in 2004, and continuing with the opening of the Scioto Mile and the Scioto Audubon Metro Park, Downtown’s

STRONGER CONNECTIONS

riverfront has been transformed. The 2010 Downtown Columbus

In addition to strengthening the connection between Downtown

Strategic Plan built on this momentum by proposing the removal

and the Scioto Peninsula, the removal of the Main Street

of the Main Street Dam and the creation of a greenway along the

Dam will better link The Ohio State University to Downtown

Scioto River as the beginning of a new green corridor through the

Columbus. With the removal of the 5th Avenue Dam at OSU on

heart of the city. The Scioto Greenways Feasibility Study , funded

the Olentangy River well underway, there will be a free-flowing,

by the Columbus Downtown Development Corporation and the

navigable river from the campus area through Downtown

City of Columbus, explores the environmental, engineering, and

Columbus. These two projects set the stage for the exploration

land planning challenges associated with removal of the dam. The

of removing or modifying other dams upstream on the Olentangy

study provides a technical solution that meets these challenges

River, with the complete realization creating a naturalized river

and shows how a naturalized river corridor and parkland will enable

corridor from Highbanks Metro Park to the Scioto Audubon

Downtown to truly embrace the Scioto River.

Metro Park through OSU and Downtown. This 16.5-mile green link would be unmatched in any major U.S. city today.

A NEW URBAN RIVERFRONT The downtown portion of the Scioto River is currently an overly-

UNLIMITED TRANSFORMATIVE POTENTIAL

wide, slow-moving pool of sediment-laden water, due to the Main

Improving the health of the river increases its value to the

Street Dam. Removing the dam would allow the water course to be

community, contributing to a more prosperous, competitive

narrowed and green space to be added along its edges. Building

metropolis for the 21st century. The removal of the Main Street

on the public and private investment in The Scioto Mile, the urban

Dam is an important first step in carrying out the vision of

riverfront would be expanded with 33 acres of new green space

a restored river corridor through Downtown Columbus and

that connects Downtown to the river and the Scioto Peninsula. The

beyond.

Master Plan Concept includes plaza and event spaces that enhance the Scioto Mile. Phase one improvements focus on new greenways on both sides of the Scioto River that would tie into the existing Downtown and regional bikeway system and allow for new access at the river level. The greenway transitions to a naturalized river edge

PROJECT GOALS

condition designed to restore river habitat and withstand flood events.

A RESTORED RIVER

•

Build on recent park investments

In addition to enhancing the public realm, removing the Main Street

•

Reduce river width

Dam allows for the implementation of a natural channel design that

•

Clean and restore river habitat

restores river habitat. Today, the downtown portion of the Scioto

•

Enhance greenway connections

River is designated as a Modified Warm Water Habitat by the Ohio

•

Improve access to river

EPA due to the lower expectations for aquatic habitat and biological

•

Create economic value and spur redevelopment

success in this area. The Scioto River can attain a higher aquatic

•

Improve linkages between downtown and Scioto Peninsula

•

Work within existing 100 year floodplain

habitat use if the physical impairments are removed and the natural

04

form and function of the river is restored. A healthier river, along with new pathways and recreational access, will bring people to the

BEFORE

AFTER - MASTER PLAN CONCEPT

executive summary

main street dam removal feasibility study

“Building on the Scioto Mile, this new urban riverfront downtown could be expanded with 33 acres of new green space.”

05

RIVER EVOLUTION EARLY HISTORY Throughout Columbus’ history, the Scioto River has been

REMAINS OF THE FEEDER CANAL

evolving. In place by the mid-1800s, the original timber dam was built to provide water for the feeder canal that connected the Scioto River to the Ohio and Erie Canal. Over this period, the river channel has been constantly changing, along with the city. Smaller river channels were filled in, islands were removed and the river course was altered to accommodate bridges, railroads, industry and other development.

RESHAPING THE RIVER The most significant changes to the river corridor occurred

INDUSTRY ALONG THE SCIOTO RIVER

after the flood of 1913. The flood destroyed the original timber dam and the river width narrowed closer to its natural watercourse. The resulting mud-flats that were exposed created an unsightly appearance in Downtown. The Main Street Dam was built in 1921 in order to create a more aesthetically pleasing riverfront, and resulted in a wider river.

This river pool was built in concert with other Civic Center riverfront improvements, including City Hall. The Main Street Dam was altered in 1929 to add another foot and half in height to the dam that created the river width of the Scioto River

DAMAGE FROM THE 1913 FLOOD

today.

THE RIVER TODAY Over time, the Main Street Dam has prevented the passage of sediment and limited the navigability of the Scioto River.

In the late 1980s, efforts were made to dredge the river to deepen the channel and allow for water craft use, but the river soon deposited more sediment and further efforts were not undertaken. Additionally, by this time the original 1920s improvements had begun to age with the concrete revetments and balustrade along the river edge crumbling into the river.

As part of the improvements to North Bank Park and the Scioto Mile, this revetment condition has been removed and the river edge has been naturalized. The balustrade along Civic Center Drive has also been restored and renovated.

06

THE MAIN STREET DAM TODAY

1845

1868 ET HIGH STRE

ET HIGH STRE

REET

REET

Feeder Canal and Sluice

•

1899

Timber Dam

1920

ET

ET

HIGH STRE

HIGH STRE

REET

REET

BROAD ST

•

BROAD ST

Scioto Peninsula Filled In Remaining Islands

1941

• •

Post - 1913 Flood Condition Timber Dam Destroyed

1939

ET

ET

HIGH STRE

HIGH STRE

REET

REET

BROAD ST

•

Wider Main Street Dam built to replace timber dam

BROAD ST

• •

Taller Main Street Dam Current River Width

main street dam removal feasibility study

BROAD ST

BROAD ST

•

river evolution

“Since the founding of Columbus the Scioto River has been evolving and changing.”

07

COMMUNITY CONNECTIONS LINKING DOWNTOWN AND NEIGHBORHOODS From Worthington to Downtown Columbus, seven low head dams

HIGHBANKS METRO PARK

interrupt the natural flow of the Olentangy River. These dams impair aquatic habitat, degrade water quality, limit recreational opportunities, and create a safety hazard. The 2010 Downtown Columbus Strategic Plan advanced a strategic vision for removing these dams to create a 16.5 mile greenway corridor that connects Scioto Audubon Metro Park and Downtown to numerous neighborhoods and High Banks Metro Park to the north. Cleaning the rivers and removing low head dams would restore the natural river course, reintroduce river habitat as a tranquil amenity, and create more green space and recreational opportunities. This

THE OHIO STATE UNIVERSITY

catalytic idea builds on the recent investment and current plans to restore river health. With North Bank Park, the Scioto Mile, and the Scioto Audubon Metro Park, nearly all of the downtown riverfront park system has been remade into a world-class park destination.

However, this investment is incomplete until the river health is restored. The City of Columbus has taken the first step toward a healthy river with its efforts to implement a $2.5 billion wet weather management program to reduce the occurrence of combined sewer overflows. The 5th Avenue Dam removal represents the first step in restoring the natural river course and enhancing habitat along this

DOWNTOWN COLUMBUS

corridor. With the removal of the Main Street Dam, the initial link in this river greenway system will be created between The Ohio State University and Downtown Columbus. In time, this model can extend north along the river corridor, connecting neighborhoods to the river and to Downtown Columbus.

COMMUNITY BENEFITS

08

•

Connected – links neighborhoods, communities, and recreational opportunities

•

Healthy – promotes physical activity and bike commuting in a beautiful and engaging environment

•

Smart – provides educational opportunities for the entire community to learn about the importance of protecting our river systems

•

Sustainable – restores the river habitat and increases biodiversity

•

Prosperous – raises property values adjacent to the greenway corridor and encourages reinvestment

SCIOTO AUDUBON METRO PARK

Highbanks Metro Park

planning context

“The Scioto-Olentangy Greenway Corridor would create a 16.5 mile green link through the heart of the city.�

R i ver

entang y O l

o ot S ci

Clintonville

R e iv r Ohio State University 5th Avenue Dam

STUDY AREA Downtown Columbus Main Street Dam Scioto Audubon Metro Park

main street dam removal feasibility study

Worthington

main st. dam

main st. dam removal feasibility study area

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RECENT AND FUTURE INVESTMENT RECENT IMPROVEMENTS The RiverSouth area and Downtown Columbus riverfront have

NORTH BANK PARK

seen hundreds of millions of dollars of public and private investment over the past decade. In addition to North Bank Park and the Scioto Mile, surrounding street infrastructure has been improved to allow for two-way traffic, and there are two new bridges across the Scioto River. New residential development at the Annex at River South has also come online to complement the existing residential properties Downtown by providing affordable rental options. The renovated Lazarus Building offers 700,000 square feet of office space and prime street-level retail in a LEED Gold certified building.

THE SCIOTO MILE

DEVELOPMENT OPPORTUNITIES The Main Street Dam removal project will capitalize on these investments and be the catalyst for further redevelopment.

Across the country, dam removal and river restoration projects have been shown to enhance the economic value of property, businesses and communities. This new 33-acre greenway in the heart of Downtown will draw people to the waterfront and encourage interaction at the river level. Building on the recent completion of two new bridges across the Scioto River that

MAIN STREET BRIDGE

provide better access to COSI and other attractions, this new riverfront greenway will further help the west bank of the river to embrace the riverfront and Downtown, acting as a catalyst for redevelopment of vacant and underutilized property on the Scioto Peninsula and East Franklinton.

ECONOMIC IMPACT SCIOTO AUDUBON METRO PARK

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•

The 33 acre greenway will increase private development and attract hundreds of thousands of visitors annually

•

Surrounding this revitalized river and greenway is nearly 100 acres of vacant and underutilized land that is primed for redevelopment, especially on the Scioto Peninsula and East Franklinton.

•

The Main Street Dam removal project will support as many as 350 new jobs in the region

NORTHBANK PARK

LAZARUS BUILDING

RICH STREET BRIDGE

COLUMBUS COMMONS

SCIOTO MILE

MAIN STREET BRIDGE

main street dam removal feasibility study

recent investment

“The Main Street Dam Removal project seeks to build on the investment and momentum along the Downtown Columbus riverfront”

SCIOTO AUDUBON METRO PARK

RECENT INVESTMENT POTENTIAL FUTURE REDEVELOPEMNT

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FEASIBILITY STUDY OBJECTIVES

a permeable gravel aquifer and the Scioto River that

The Main Street Dam Removal Feasibility Study had four

both discharges and receives water from the river.

primary objectives: •

•

•

Sediments: Sediment samples contained some con-

Develop a thorough understanding of the river and the

taminants above residential levels. Ohio EPA indicates

land and structures within and around it.

preliminarily that these contaminants may not need to

Determine the potential environmental and engineering

be removed but could be reused under certain condi-

issues involved in removing the dam, particularly the

tions.

impact on the 100 year floodplain •

•

Develop a concept plan for the river channel that restores

DEVELOPING THE CONCEPT PLAN

the natural river course and improves water quality

With this baseline information determined, a Concept Plan

Expand the concept plan to show how the reclaimed

for the dam removal and addition of parkland was created

public land on either side of the river could be reused as

to demonstrate what could be done with the narrowed river

urban park space

channel in terms of new open space and restored river habitat in Downtown. This plan adds 33 acres of additional green

ADDRESSING THE CHALLENGES

space to Downtown and offers a new pedestrian linkage be-

Throughout this project numerous issues were addressed:

tween Downtown and COSI in addition to enhanced river rec-

•

Historic Preservation: Study outlined changes made to

reation opportunities and extensive new pathways and river

the Scioto River over time and determined that the Main

viewpoints. The proposed dam removal, restoration design,

Street Dam is not in the Civic Center Historic District,

and park improvements were then modeled and compared to

although the project is subject to Section 106 of the

existing conditions along the river. No rises in one-percent an-

National Historic Preservation Act of 1966.

nual chance flood elevations will occur. The Standard Project

Ecology: Determined that the dam is inhibiting the river

Flood will remain contained within the floodwall. Average an-

from reaching its potential use attainment designation

nual river elevations will decrease by approximately seven feet

of Warm Water Habitat, and that dam removal and river

immediately upstream of the former dam location. Likewise,

restoration will improve habitat for native fish and mussel

the structures and bridges within the river corridor were also

species that should reside in the Scioto River.

assessed and changes recommended in order to mitigate

Hydrogeology: Found that there is a relationship between

impacts of the river lowering.

•

•

RESPONSES

CONCERNS 1.

Utility Crossings will be exposed by lower water

1.

Proposed river bed will maintain cover above

2.

Existing lines will be extended to ensure that the

3.

Bridge piers will either be on the banks of the new

existing utility crossings.

levels and impacted by increased scour.

2.

Combined Sewer Overflow odor will increase due

submerged condition remains, containing odor.

to lower water levels.

3.

Piers of existing bridges will be exposed by drop-

river, or will have extended caps on piers to ad-

ping the water level.

dress concerns.

4.

5.

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Foundations near river for OSIS, floodwall, and

4.

Groundwater in the area feeds the river and is

adjacent buildings could be damaged by the

currently cut-off by the floodwall. The groundwater

lowering of the river.

conditions today will not be altered.

Flood levels could be adversely impacted by removing the dam.

5.

The 100 year floodplain extents are not altered as part of this project, allowing the river and park system to handle flood events.

BEFORE

AFTER

main street dam removal feasibility study

feasibility study

“With the removal of the Main Street Dam the Scioto River will be narrowed by nearly half and Downtown Columbus will gain 33 acres of new riverfront park land.�

13

RIVER CHANNEL NARROWING NATURAL DESIGN MODELING OF THE CONCEPT As part of the Feasibility Study, the impact of the dam removal

FLOODPLAIN WIDTH

and the implementation of a natural channel design for the Scioto EE HIGH STR

River were assessed. Modeling of the proposed conditions resulted in no rises in the 1% annual chance of flood elevations

T

and found that the Standard Project Flood will remain contained within the floodwall. In general, the 100 year floodplain extents are not altered as part of this project. In certain areas, especially in front of COSI, it actually improves slightly (see diagram at right).

BROAD

STREET

IMPACT ON THE RIVER LEVEL While the impact of the dam removal is greatest immediately upstream of the former dam location, resulting in a seven foot decrease in the water surface elevation based on average annual flow conditions, the entire river corridor will see a decrease in channel width. The sections at right illustrate this change in channel width and the added greenway (based on average annual flow conditions).

Existing 100 year floodplain Proposed 100 year floodplain reduction

HABITAT RESTORATION Removing the dam and implementing a natural channel design will result in an increase in ambient dissolved oxygen, a reduction in low flow water temperatures, and an improvement of habitat

CHANNEL WIDTH

diversity and aquatic habitat. The natural channel design will also HIGH STR

provide the necessary substrates and flow regimes needed for the recolonization of fish and mussel species that were once found ON

EET

in this segment of the Scioto River. The dam removal will also

1

TI

C SE

allow these species to migrate upstream, increasing the diversity of those aquatic communities. Due to these improvements, an increase in the Qualitative Habitat Evaluation Index from the Ohio

BROAD

STREET SECTION

2

EPA is expected for this segment of the Scioto River.

SE

CT

ENVIRONMENTAL BENEFITS

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•

Recreates and restores a more natural channel for the Scioto River

•

Has a positive impact on water quality, river health and aquatic habitat

•

Provides for the recolonization of native fish and mussel species

•

Allows for upstream migration, increasing the diversity of these aquatic communities.

IO

N

3

Existing Channel Proposed Channel

VETERANS MEMORIAL

Existing crossing =

495 feet

•

Proposed crossing =

250 feet

•

Width reduction =

245 feet

EXISTING

495’ E

xisting

Crossin

g

SC I RI OTO VE R

•

SC I RI OTO VE R

SECTION 1

natural channel design

FEDERAL COURTHOUSE

PROPOSED

BICENTENNIAL PARK

SECTION 2 •

Existing crossing =

495 feet

•

Proposed crossing =

245 feet

•

Width reduction =

250 feet

SC I RI OTO VE R

HEALTH DEPARTMENT SITE EXISTING

495’ E

Cross

ing

SC I RI OTO VE R

xisting

PROPOSED

245’ 495’ E

Propo

xisting

sed C

rossin

Cross

g

ing

SCIOTO MILE PROMENADE

SECTION 3 Existing crossing =

570 feet

•

Proposed crossing =

270 feet

•

Width reduction =

300 feet

EXISTING

570’ E

xisting

Cross

ing

SC I RI OTO VE R

•

SC I RI OTO VE R

COSI

main street dam removal feasibility study

250’ P ropose d Cros 495’ E sing xisting Crossin g

PROPOSED

270’ P ropose d Cros 570’ E sing xisting Cross ing

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MASTER PLAN CONCEPT INTRODUCTION

PROJECT PHASING

With the engineering parameters of the Main Street Dam Remov-

To enable the efficient implementation of this project, the pro-

al defined, the project team created a Master Plan Concept for

posed Master Plan Concept improvements have been divided

the narrowed river, restored river edge and adjacent greenway.

into two phases. The Master Plan diagram at right highlights

The implementation of a natural channel design allows for the

major plan components under each phase.

creation of approximately 33 acres of ground that can be used to meet floodplain requirements, restore river habitat and create

Phase One components focus on dam removal, river channel

greenway connections.

formation, river restoration and associated greenway and bike path components. Phase Two components include event and

New pathways on both sides of the Scioto River tie into the

plaza spaces, additional hardscape and landscape features and

existing downtown and regional bikeway system and allow for

fountains, and a pedestrian bridge across the Scioto River con-

interaction and access at the river level. The park pathway and

necting the Scioto Peninsula to the Scioto Mile Promenade. Ren-

plaza areas transition to naturalized river edge condition that is

derings of all Phase One components are shown on subsequent

designed to withstand flood events. The greenway will link into

pages of this report. An Implementation section follows that

the existing bikeway system with bike paths and landscaped

outlines the preliminary estimate of probable cost for Phase One.

park areas. This greenway corridor will connect The Ohio State University to Downtown Columbus and provide recreational opportunities such as cycling, canoeing and kayaking. Taken together, these improvements will create an opportunity for the public to experience and interact with the river in a more natural state.

The Master Plan Concept seeks to build on recent park investment along the downtown riverfront from North Bank Park to

PHASE ONE IMPROVEMENTS

the Scioto Audubon Metro Park. Elements of the Scioto Mile will be enhanced with new plaza and event spaces, especially at the Town Street Prow that will have a two-level overlook. On the west side of the river, an extension of the plaza and lawn in front of COSI will create an expanded event space. Building on

•

Removal of concrete low head dam south of the Main Street Bridge

•

Removal of accumulated sediment behind dam

•

Restoration of a more naturalized and narrower river course and channel topography with the creation of pools, riffles, and glides that improve river flow and habitat.

•

Creation of a stabilized riveredge and naturalized river bank using bioengineering methods – no riprap or concrete walls with the exception of limited, target areas for public access to the river edge.

•

Construction of a greenway system with bike paths, park space, and connections to existing public parks and amenities.

the theme of connections, a proposed pedestrian bridge will directly connect COSI and the Scioto Peninsula to the Scioto Mile Promenade and Downtown Columbus helping to visually and physically link these two nodes of activity.

With these improvements, Downtown will no longer turn its back on the Scioto River. Instead, it will be able to use the river for recreation, admire it for its natural beauty and celebrate it as the “central park” of Downtown Columbus.

16

concept plan

“Downtown Columbus will no longer turn its back on the Scioto River. Instead, people will be able to use it for recreation, admire it for its natural beauty and celebrate it as the ‘central park’ of Downtown Columbus.”

1

2

2

1 7 3 3

8 5

4 6

MASTER PLAN CONCEPT PHASE ONE COMPONENTS

PHASE TWO COMPONENTS

1.

5.

Restored River Channel: Reconfigured river channel

Town Street Prow: Two-level plaza space that preserves

sculpted with pools, riffles and glides to create a more

the existing Town Street Prow and creates a lower-level

natural and healthy river environment, supporting a diverse

overlook to the river and West Bank. The two levels are

aquatic habitat.

connected by a grand stair along the south edge of the existing Prow.

2.

Restored River Edge: Bio-engineered, stabilized and vegetated river edge with native plant material and riparian

3.

4.

6.

East Landing: Urban plaza and event space that provides a

habitat. The river edge transitions from native plantings to

connection between Downtown Columbus, the Scioto Mile

manicured parkland upslope of the leisure trail.

Promenade and the pedestrian bridge.

Leisure Trail: Continuous 12-foot-wide leisure trail on both

7.

Event Plaza and Lawn: Extension of the plaza and lawn

the east and west banks that is integrated with the Scioto-

space in front of COSI to create a venue for expanded

Olentangy Bikeway and larger regional bike trail system.

festivals, events and exhibits.

Scioto Quay: Lower level walkway along river’s edge. The

8.

main street dam removal feasibility study

2

2

3

Pedestrian Bridge: Signature bridge for pedestrians con-

quay brings people to the river and provides a link in the

necting COSI and the Scioto Peninsula to the Scioto Mile

trail system.

Promenade and Downtown Columbus.

17

BEFORE

18

AFTER - PHASE ONE

concept plan

main street dam removal feasibility study

“This project has such tremendous potential to transform the image of our city.�

- public comment

19

BEFORE

20

AFTER - PHASE ONE

concept plan

main street dam removal feasibility study

“Removing the dams will help clean up the river and improve the experiences throughout the neighborhoods along the river corridor into Downtown Columbus and the Scioto Audubon Metro Park.�

- public comment

21

BEFORE

22

AFTER - PHASE ONE

concept plan

main street dam removal feasibility study

“This idea is groundbreaking. It returns the river to its natural flow and uses a sustainable model for flood management.”

- public comment

23

BEFORE

24

AFTER - PHASE ONE

concept plan

main street dam removal feasibility study

“Ohio means ‘beautiful river.’ As the state capital, Columbus could be the showcase of what a natural, beautiful river looks like.

I would dedicate my life to making this idea a reality.”

- public comment

25

IMPLEMENTATION WHAT WILL IT COST

•

Based on the concept developed as part of the Feasibility Study,

Greenways (Transportation): includes all pathways and bikepaths and associated hardcape improvements.

a preliminary estimate of probable cost was prepared. Below is the estimate for Phase One improvements, which is divided into

•

several project categories:

Greenways (Park Space): includes all park space improvements adjacent to pathways and bikeways.

• •

Existing Conditions / Site Preparation and Dam Removal:

MOVING FORWARD

Involves project mobilization and the demolition of the Main

The Main Street Dam Removal will require a coordinated effort

Street Dam.

among multiple regulatory agencies and the private and public sectors to achieve implementation. This new 33-acre green

•

River Restoration: includes all necessary earthwork as part

space will improve the health of the river and increase its value

of removing sediment and adding necessary fill to create

to the community. Building on recent park investment and

the adjacent parkland, the creation of the new river channel,

planned improvements, this new “central park” will be a green

and the restoration of the naturalized river edge itself.

link that both creates a more cohesive Downtown and connects it to the wider city. Taken together, these improvements to the

•

Utility Work: includes required extensions and protection of

river corridor will help the city become a more prosperous and

existing utilities that are exposed as part of the lowering of

competitive metropolis for the 21st century.

the river level.

Dam Removal $325,415 River Restoration

1%

$20,194,304 57%

Existing Conditions / Site Preparation $3,003,212 8%

Greenways (Park Space) $4,109,125 12%

Greenways (Transportation)

Utility Work

$3,878,757

$3,995,493

11%

11%

Existing Conditions / Site Preparation Dam Removal River Restoration Utility Work

26

Greenways (Transportation) Greenways (Park Space)

AFTER - PHASE ONE

main street dam removal feasibility study

BEFORE

27

implementation