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Home My WebLink About98-0501.FLOOD MEMO.PAULABCITY OF ASHLAND Department of Public Works Public Works Administration DATE: May 1, 1998 TO: PROM: Honorable Mayor and City Council Members Mike Freeman, City Administrator Paula C. Brown, Public Works Director / City Engineer FLOOD REPAIRS / IMPROVEMF-NTS ALONG CALLE GUANAJUATO STATUS UPDATE Back~'ound The New Year's Flood of 1997 has left us with a number of issues. One issue is the restoration and any improvements or flood mitigation efforts to be constructed on the Ashland Creek reach along Calle Guanajuato. Prior Decisions The City Council approved the Otak Report (Ashland Creek Restoration Project, November 1997) and at least in concept, approved those recommendations. The Otak Report was predicated on building a structure (Winburn Bridge) that could withstand the determined 100 year flood flows of 3100 cubic feet per second (cfs). This recommendation of building or improving structures to withstand the 100 year flood was extended to other structures (bridges) on Ashland Creek if possible. The understanding was that there is potential for sheet flows along Winbum Way as the creek channel itself is not capable of containing 3100 cfs above the bandshell. It was also understood that the creek channel, Winburn Bridge and any potential sheet flows in Winbum Way would contain all the flow and not allow water through lower Lithia Park or in the Plaza. As discussed in a joint City Council / Parks Commission session on March 17, 1998, the budgetary implications and priorities relative to the overall City and Parks issues, must also be included. At this time, the City and Parks staffs are working together to develop the best course of action. As proposed during the joint session, the Parks Depa~h,ent is currently taking the lead to develop a number of alternative design scenarios for Calle Guanajuato. The Parks Depm-/ment has hired Brian McCarthy to develop the conceptual scenarioS. These concepts will have an "engineering" reality check as each will bc run through the model developed by Otak to determine the hydraulic capacity of the cross sections suggested by each scenario. The engineering portion of the project is being coordinated by the Public Works / Engineering staff. These scenarios for Calle Guanajuato will come back to both the Parks Commission and City Council for review, discussion, and ultimately for approval after an extensive public involvement process. There will also be future discussion regarding other reaches of Ashland Creek and repairs or improvements necessary for those area. These other pro~ects may not impact the Parks Department. CITY OF ASHLAND Administration Office of the City Administrator MEMORANDUM DATE: TO: FROM: RE: March 13, 1998 Honorable Mayor and City Council On March 17, 1998, the Council and the Parks & Recreation Commission will be meeting at 6:00 p.m. to discuss mutual flood restoration budget issues. As you know the Ashland Creek Flood Restoration Report prepared by OTAK identified a number of improvements which will have to be considered. One of these projects is the Calle Guanajuato which could be a joint project between the City and the Parks Commission. The attached report outlines the issues which both Ken Mickelsen and I would like to discuss. It is hoped that we can reach consensus as to a cooperative approach to funding and prioritizing the vadous projects. Please note' that at 5:45 p.m. we will have sandwiches and drinks for the Council and Commission. Attachments: Flood Restoration Issues Paper Priority Matrix Barbara Christensen Paul Nolte Parks 8, Recreation Commission Ken Mickelsen FLOOD RESTORATION OVERVIEW: The 1997 New Year's Day Flood caused considerable damage to the City of Ashland, on both public and private properties. The flood also raised concerns regarding the capability of our creeks, drainage systems and facilities to adequately convey and carry 100-year flood flows. The City, with Parks Department participation, completed a comprehensive analysis of Ashland Creek and its flood carrying capabilities. As a result the Winburn Bridge was reconstructed to accept a 100-year flood (flows of 3100 cubic feet per second, efs). In addition to Winburn Bridge, several other flood restoration projects were identified to bring those facilities into the 100-year flood flows and improve flood facilities operations and management techniques including: · · · · · · Calle Guanajuato (constructing a flood wall or similar measures along the east side) Main Street Bridge improvements Water Street Bridge replacement Van Ness Avenue Bridge replacement Hersey Street Bridge replacement Parks and Public Works Departments Flood management improvements In addition to the work completed on Ashland Creek, the City is completing a Storm Drain and Drainage Master Plan which will endeavor to review flood restoration needs in other drainage areas within the City (Hamilton Creek, Clay Creek, Wrights Creek, etc.). BUDGET TRENDS/CHANGES: Prior year's budget included the immediate flood damage improvements and recovery efforts. The bond issue passed and the City was able to obtain FEMA and HUD funds to assist with the emergency issues and immediate repair needs. The majority of available funding for these projects has been expended. This year's budget request is an extension of flood restoration needs. Although limited funding is identified (approximately $460,000 and is grant 'dependent), there may be other funding options and parmerships available. Funding for the remaining flood restoration projects may be a long term issue and will be dependent upon priorities. A plan for project prioritization, funding, and completion should be a major goal of the continuing Flood Restoration Program. MAJOR GOALS: Flood Restoration needs are as follows: · Determine a process to pdortize project identification, funding and completion schedule. · Include parmerships for funding and prioritization development. · Immediate priorities (within the next 5* years) should include Calle (]uanajuato with Main Street Bridge improvements, and Water Street Bridge and departmental flood management improvements. · Longer term priorities (5-15 years) may include Van Ness and Hersey Street Bridges. · Staff will continue to pursue developing Flood Management Strategies and improving flood plain zones/mapping amendments as necessary. CAPITAL OUTLAY: Assuming one of the flood project priorities is adopted for implementation in this year's budget we will need to identify conceptual design (community based), engineering design and approvals, financing options and finally construction. We have tentatively identified three shorter term projects that need prioritization: · Calle Guanajuato improvements (coordinate with Parks Department, and Plaza Merchants/Building Owners) · Main Street Bridge improvements (coordinate with.ODOT) · Water Street Bridge replacement We are projecting $460,000 expenditure this year (1998/99) which could complete one of the projects listed with potentially additional funding from the partners listed above. Table 3: Structure Flood Depth, Assigned 2 Value* Lithia Poxk 2 -Winburn Reach Way & Park W'mburn Way 3 -park, Plaza, Culvert Winburn Way Calls Reach and Main Street Bridge Priority Matrix for Culverts/Bridges and Reaches Road/Park Nonhab. Habitable Building Bldg >Oft >lft ,q. lft >lft 3 3 5 2 -Band shell & Storage 2 -IAthia Care & Pioneer bldg 12-Hfilah, 10 bldgs (Plaza side), Corem bldg Score 16 42 2 -bldgs in Calle 6 -bldgs in 36 Calle Main Street 1 -bldg in Calle Bridge Rank Bluebird Park Reach IAth/a Way 1 .Water St Culvert Lith/a Way to Water Street Reach 2 5 -bldgs in 28 3 Calle 3 -two rest. & 15 6 31 Water St 3 -two rest. & 17 4 31 Water St 1 -Restaurant 3 9 Water Street 1 ,Water St 1 -Comrnerc/al 6 -new 1 -Water St 28 Culverts prop Condo.*** Inn Water S!~eet 1-Water St 5 to Van Ness In. Van Na~ 2 -Van Nea~ & i -Recycle 1 -Houze& 10 Culvert Water St Center Garage SPRR to Herzey Street R~ch 1 -Craurch 3 9 Hersey Strac~ 1.Hersey St 1-Church 6 Bridge * A~igned value based on rdative economic impact ofpotential flood damage at the location li~ted. Doe~ not indud~ flow ~apacity since bridg~ l ~lvert~ that have a high ~apadty du~ to high available head may contribute to high backwater effects. 8 ! ! ** Doe~ not indud~ seasonal improvements such az the ice skating rink which could be damaged by flooding. This fact, coupled with the desire to keep W'mdburn Way dry during all but the most extreme flood events, may raise the justificution for the implementation of Re¢omm~ndations 1.7 and 1-8 to a higher priority than would otherwise be accounted for in this subjective ranking. *** Due to multipl~ r~idences, the new condominium adjacent to the Water Street culverts is listed as being equivalent to six habitable buildings. Ashland Creek Hydraulic Investigation