STRUCTURES
EXISTING BUILDINGS AND STRUCTURES
There are eleven PP&R owned and operated buildings in Washington Park. They provide basic park functions such as restrooms, information, concessions, covered picnic shelters, maintenance, and storage. Their ages and conditions vary. According to input from PP&R staff and the public response to the online survey, there are needs for additional restrooms and public amenities throughout the park, as well as improved and expanded maintenance and storage space to meet current maintenance staff requisites. The other buildings shown on the map are not maintained and operated by PP&R and so were not assessed here.
HOYT ARBORETUM VISITOR CENTER/ MAINTENANCE SHOP
STEVENS PAVILION
RESTROOM/CONCESSION BUILDING
#151/152 | Built 1995 | 1500 sf | 1.90 S Score The Visitor Center houses an information desk, gift shop, library/meeting room, public restrooms, offices, and separate maintenance facility.
#153 | Built 1995 | 1600 sf | 2.90 S Score The A-frame picnic shelter provides an outdoor covered area for picnics. It can be rented for private events.
#406 | Built 1924 | 400 sf | 1.00 S Score This building originally served visitors recreating on the open lawns of ‘City Park.’ The restrooms have since been renovated and the concession area is now used for storage.
ZOO BEAR HOUSE
ELEPHANT HOUSE
ZOO RAILWAY BUILDING
#407 | Built 1927 | 2300 sf | 0.70 S Score The lower level housed bears in the original zoo. It is currently used for Maintenance, and storage for Events and the Gift Shop.
#409 | Built 1954 | 1600 sf | 1.50 S Score Built to house the zoo’s Rosy the elephant, it now serves as a picnic shelter with restrooms and storage. It can be rented for private events.
#419 | Built 1950 | 1125 sf | 2.90 S Score The station is currently closed. It was originally used for ticket sales and boarding of the zoo train back to the Oregon Zoo. It is leased by Metro for this purpose.
WESTSIDE MAINTENANCE FACILITY
ROSE GARDEN STORE/RESTROOM
ROSE GARDEN RESTROOM & CURATORS OFFICE
#421 | Built 2000 | 4680 sf | 2.00 S Score The metal pre-fab maintenance office and storage building was built in 2000.
#425/426 | Built 2000 | 790 sf + 840 sf | 3.8 S Score The Rose Garden Store and Restroom buildings were designed under the 1997 building code, have viable, intact structural systems, and are in good physical condition.
#431 | Built 1925 | 450 sf | 1.00 S Score The most photographed building in the park is maintained to retain its original purpose and character.
Seismic Vulnerability For this report, the eleven park buildings were assessed and scored for seismic vulnerability per FEMA P‐154 Rapid Visual Screening (RVS) of Buildings for Seismic Hazards: A Handbook. SCORE: The basis for the calculation of a score that is an indication of the expected seismic performance of a building, or “S” score. A final “S” score of 3 implies that there is a 1:1,000 chance that the building will collapse if a “design basis” earthquake occurs; an “S” score of 2 implies a 1:100 chance that the building will collapse. The lower the “S” score, the higher the chance of collapse in the event of a significant earthquake. Three of the oldest and most historic buildings stand out as being seismically vulnerable, and have “S” scores of 1 or lower: #407-Zoo Bear House, Rose Garden Restroom & Curator’s Office (431), and Restroom/Concession Building (406). 1. Zoo Bear House (407) has many readily visible structural deficiencies and vulnerabilities, including pre‐code vintage, deteriorating concrete basement walls, dry rotted wood framing, steeply sloped site and a soft story irregularity, resulting in a score “S” of 0.70. Given the condition of its structural system and its location on a steep hillside, there is a likelihood that a relatively minor earthquake could render significant damage to the building. Currently, the building is leaning slightly downhill, which could be a sign that the slope has moved or that soils are settling under the structure. Since a trail passes in front of the building on the downhill side, park visitors could be in harm’s way during an earthquake. 2. Rose Garden Restroom & Curator’s Office (431) is in need of seismic upgrade to improve seismic resiliency. The “S” score is 1. 3. Restroom/Concession Building (406) also received a “S” score of 1 and is in definite need of seismic upgrade to improve seismic resiliency. 4. In the Westside Maintenance Facility (421) and the shop area at the Hoyt Arboretum (151/152), fuel and other flammable or hazardous materials are stored in open, tall, unbraced cabinets and heavy landscape maintenance equipment is stored on tall unbraced racks that are not anchored to the floor slab. In a moderate earthquake, these elements could collapse, spilling their contents and creating a significant and hazardous impediment to building occupants trying to leave the building. The remaining buildings assessed currently pose moderate to low risk to the public and would require relatively minimal or no structural upgrades to improve their seismic resiliency.
22 LAND STRUCTURES
WASHINGTON PARK MASTER PLAN UPDATE
TECHNICAL INVESTIGATION & PUBLIC OUTREACH, DEC 2016