Cowen Park Historic Bridge 2
Total Page:16
File Type:pdf, Size:1020Kb
1 of 8 Funding Application Competition Regional TAP Application Type Historic Resource Status submitted Submitted: September 20th, 2017 11:35 AM Project Information 1. Project Title Cowen Park Historic Bridge 2. Transportation 2040 ID N/A 3. Sponsoring Agency Seattle 4. Cosponsors N/A 5. Does the sponsoring agency have "Certification Acceptance" status from WSDOT? Yes 6. If not, which agency will serve as your CA sponsor? N/A Contact Information 1. Contact name Jim Storment 2. Contact phone 206-684-5013 3. Contact email [email protected] Project Description 1. Project Scope The City of Seattle will retrofit the historic Cowen Park Bridge to meet current seismic standards. Based on preliminary design work, these upgrades are expected to include jacketing columns, bolstering crossbeams, and adding transverse restrainers at expansion piers. 2. Project Justification, Need, or Purpose The Cowen Park Bridge is a concrete arch bridge, built in 1936 and identified in the 1980s as a historically significant structure. It is locally designated as a city landmark, and also nationally recognized as a significant historical asset by the National Register of Historic Places (NHRP). The bridge’s architectural style is an "open spandrel" arch bridge designed to be an integral part of its wooded environment. It features a single, expansive concrete arch spanning most of its 358-foot length, as well as artistically sculpted concrete pillars under the bridge deck. Art deco-style light standards, cast in iron and mounted on fluted concrete posts, line the top of the deck. The bridge is placed in a very attractive, forested setting, spanning a steep ravine within a public park. This setting greatly enhances its public visibility and attractiveness, both for enthusiasts of historic structures and for a wide variety of casual viewers. for enthusiasts of historic structures and for a wide variety of casual viewers. 2 of 8 Cowen Park Bridge is also one of the few historic bridges that still has a significant workload in modern times. The bridge supports 15th Ave NE, a minor arterial roadway carrying approximately 12,000 vehicles per day. 15th Ave NE is one of the primary connections between the locally-designated Roosevelt Urban Village and the regionally-designated University Community Regional Growth Center. The Cowen Park Bridge is 1 of 2 bridges across the Ravenna Park ravine. Its “twin bridge,” along 20th Avenue NE, was built in 1913 and is no longer open to vehicular traffic. Retrofitting the Cowen Park Bridge now is expected to preserve the structure for many decades. In its current condition, the bridge does not meet design standards for a “100-year earthquake” – the most severe quake that geologists would normally expect every 100 years. After seismic retrofit, the bridge would be rated to withstand not only a 100-year quake, but also a 1,000-year quake. The City of Seattle has a bridge inventory of approximately 150 bridges, many of them built in the early 1900s when the city itself was young. Structural engineers recognize that dozens of these bridges must be either replaced or closed within the next several decades. No revenue stream has been put in place to keep up with this backlog. The first bridges to be replaced or closed will be those that create a life safety hazard. When Cowen Park Bridge reaches this condition, due to its seismic vulnerability, it is not a realistic candidate for closure due to its significance in the transportation network. It would need to be replaced, regardless of its historical significance and its value to the community. Of course, if a seismic event occurs soon, the City could anticipate an immediate and necessary closure. However, with seismic retrofit, the only limitation on the life of the bridge would be its load- bearing capacity. Experience with similar structures indicate that the bridge could have an extensive lifespan still ahead. It could easily continue to add functional and historic value to the community for at least 40 to 60 more years. Project Location 1. Project Location 15th Ave NE 2. Please identify the county(ies) in which the project is located. King 3. Crossroad/landmark nearest the beginning of the project Ravenna Blvd NE 4. Crossroad/landmark nearest the end of the project NE 65th St 5. Map and project graphics CowenBridge.pdf Plan Consistency 1. Is the project specifically identified in a local comprehensive plan? No 2. If yes, please indicate the (1) plan name, (2) relevant section(s), and (3) page number where it can be found. N/A 3. If no, please describe how the project is consistent with the applicable local comprehensive plan, including specific local policies and provisions the project supports. Seattle's Comprehensive Plan identifies maintenance and preservation as a core responsibility of the City and a top priority for its Department of Transportation. Transportation assets that serve identified centers are prioritized as having special significance. The Transportation element of the Comprehensive Plan begins with a preservation-related goal: Goal T 1.1 states that the City will "provide safe and reliable transportation facilities and services to promote and accommodate the growth this Plan anticipates in urban centers, urban villages, and manufacturing/industrial centers." The Comprehensive Plan later dedicates a full section to the topic of "Operating and Maintaining the Transportation System," with the following introduction: "Thoughtful operation and maintenance of the transportation system promotes safety, efficiency, infrastructure preservation, and a high-quality environment. Spending money on maintaining and preserving the system today can prevent spending more dollars on replacing parts of the system later. This is particularly true for the more expensive and vital transportation assets, such as This is particularly true for the more expensive and vital transportation assets, such as 3 of 8 pavement, sidewalks, parking pay stations, intelligent transportation system devices, traffic- signal infrastructure, and bridges." Within this dedicated section of the Comprehensive Plan, several goals and sub-goals speak directly to the importance of preserving and managing assets: - TG 8 Maintain and renew existing transportation assets to ensure the long-term viability of investments, reduce ongoing costs, and promote safe conditions. - T 8.1 Maintain the transportation system to keep it operating and to maximize its useful life. - T 8.4 Repair transportation facilities before replacement is necessary; replace failed facilities when replacement is more cost-effective than continuing to repair. Federal Functional Classification 1. Functional class name 16 Urban Minor Arterial Support for Centers 1. Describe the relationship of the project to the center(s) it is intended to support. For example, is it located within a designated regional, countywide or local center, or is it located along a corridor connecting to one of these areas? The Cowen Park Bridge is located on the border of a locally designated growth center. Its northern footings are within the Roosevelt Urban Village, while the bridge span and southern footings are on the perimeter of the designated center. The bridge spans a ravine within a park, and the edge of the ravine is also the boundary of the urban growth center. The roadway on the bridge deck - 15th Ave NE - passes through the Roosevelt Urban Village and provides direct access to a series of locally and regionally designated growth centers. It extends approximately 9 miles through north Seattle and Shoreline. In addition to the adjacent Roosevelt Center, other centers along the corridor include the University Community Regional Growth Center (0.7 miles south) and the Northgate Regional Growth Center (2.5 miles north). Each of these growing and thriving centers depends on 15th Ave NE to provide access to homes, jobs, and schools within the centers. Roosevelt Urban Village: The Roosevelt Urban Village is one of Seattle’s historic residential neighborhoods, with a large stock of older craftsman-style homes – but the neighborhood is experiencing very rapid growth with the introduction of light rail. The neighborhood’s growth rate since 2015 has been over 20%, making it one of the City's fastest-growing urban villages. Only the South Lake Union Regional Growth Center, home of Amazon.com, has grown at a faster rate in recent years (over 29%). University Community Regional Growth Center: The “U District” contains approximately 24,000 residents and 33,000 jobs, making it one of the largest and densest urban centers in the region. Jobs are focused within the University of Washington campus, with relatively affordable housing surrounding the campus. Transportation demand is very high in this center, with approximately 50,000 students from around the region attending classes at the UW campus (in addition to the usual trip generators, homes and jobs within the center). Football games and other special events on campus can draw over 70,000 visitors at punctuated periods. Traffic congestion and delays are consistently high in this center. Northgate Regional Growth Center: This growth center contains approximately 8,000 residents and 12,000 jobs, and it is anticipating rapid growth with the expansion of light rail. The center’s major attractions include the Northgate Mall and Northwest Hospital, one of the city’s few hospital complexes outside of central Seattle. Single-family residential neighborhoods surround the commercial core. It has historically been one of Seattle’s more affordable neighborhoods, and the jobs within the center are very heavily oriented toward retail and services (approximately 90% of all jobs). North Seattle College is just outside the center’s boundary. The combination of a local college, relatively lower wage jobs, and a stock of affordable housing make Northgate a primary area of emphasis for lower-income communities and other populations protected by the President’s Order for Environmental Justice. These same land uses – major colleges, shopping centers, and medical centers – also ensure that the center is a major draw for visitors from throughout the region.