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HomeMy WebLinkAbout1979-12-04; City Council; 5894-1; Agua Hedionda Lagoon Bridge Replacementk... 1 0 fj! ; ! CITY OF CARLSBAD - - Initial : AGENDA BILL NO. DATE : December 4, 1979 DEPARTMENT: Engi neeri ng SUBJECT : AGUA HEDIONDA LAGOON BRIDGE REPLACEMENT - FUNDS FOR PLANS AND SPECIFICATIONS STATEMENT OF,THE MATTER The bridge over Agua Hedionda Lagoon on Carlsbad Boulevard has been identified as deficient both from a structural and a traffic standpoint. In June, the City contracted with the firm of Kercheval and Associates to develop a preliminary design for the bridge replacement and to prepare an application for funding under the Federal Highway Bridge Replacement and Rehabilitation Program (HBRR) . The consultant has determined that the bridge replacement project may be eligible for funding in October 1981. eligible for HBRR funding, but these funds would not be available until October, 1981. The City, should it wish to proceed with the project, may elect to utilize Federal Aid Urban Funds for design and repay these funds from HBRR funds in 1981. FAU funds required far design would be about $137,474. Preparation of plans and specifications are also I EXH I B ITS Bridge Geometrics Memo to Public Works Administrator from City Engineer RECOMMENDAT ION That the City Council authorize preparation of a request to the Federal Aid Urban Advisory Committee for the use of $137,479 in FAU funds for the preparation of plans and specifications for the Agua Hedionda Bridge replacement. Council Action: 12-4-79 Council approved staff recommendation 1 isted above. - Iti, CIVIL ENCINEERi. 4 KERCHEVAL ANI) Ass ~ATES 9420 FARNHAM SI.. STE. I13 SAN DIEGO. CALIF. 92123 (711) 571452U GEOMETRICS During the study of alternatives, it was readily apparent that the least costly and most cost effective project for a four-lane road- way FAU project and a four-lane Bridge Replacement Project would be one built in the present right of way. lane boulevard north of Tamarack and is narrowed to two-lanes just Carlsbad Boulevard is a four- , north of the Agua Hedionda Lagoon Bridge crossing. The roadway south of the bridge is a two-lane road. From the Tamarack Avenue intersection to just south of the bridge, the road is straight. radius curve for a thousand feet and then through a tangent section on to two short large radius curves, then tangent through the Cannon Roaa intersection. Then the road goes into a five thousand foot -. There is parking along the east side of the road from c the bridge south to the SDG & E Power Plant. There is a parking area on the east side of the road for fishing in the lagoon and two parking areas on the west side for the State Beach. The only reason to consider a major change in the geometrics might be in the vertical alignment of the bridge. do not allow the lagoon to be navigable from the ocean both because of the tidal actionjturbulent flow under the existing bridge and the present use of the laggon by the owner SDG & E. To raise the grade of the bridge would cause, in addition to higher construction costs, a need for additional right of way from park lands. The present conditions Needless to say, this action would be un- -20- desirable from a time standpoint as 4F Statements and additional planning c efforts would be required. The recommended horizontal and vertical a1 ignment utilizes the, existing a1 ignment to the maximum. under traffic with minimum disruption and utilization of existing pave- ment and foundation. This alignmsnt allows for construction The recornended alignment also allows for the bridge to be built in a two stage construction sequence using one-half the new bridge as a detour while the old one is torn out. The envisioned roadway section is to be four twelve foot lanes with a six foot bike lane on each side. This would give a total paved roadway width of of sixty feet. * . , 1. MEMORANDUM TO : Public Works Administrator FROM: DATE: November 26, 1979 City Engineer % SUBJECT: AGUA HEDIONDA LAGOON BRIDGE REPLACEMENT In June, the City contracted with Kercheval and Associates, Consulting Engineers, to develop a preliminary design for the Agua Hedionda Lagoon bridge replacement, and to prepare an application for funding under the Federal Highway Bridge Replacement and Rehabil i tation Program (HBRR).. The bridge over the Agua Hedionda Lagoon on Carlsbad Boulevard has been identified as deficient structurally and from a traffic standpoint. Kercheval and Associates have proposed the construction of a four-lane structure to be built in two stages using one-half the new bridge as a detour while the old one is torn up. The pro- posed bridge replacement would be within existing right-of-way and should allow for construction with minimum disruption of traffic and maximum utilization of existing pavement and foundation. The estimated cost of the project replacement'is 1.12 million dollars. that we would also widen Carlsbad Boulevard to four lanes in conjunction with the bridge replacement, an additional $185,000 would be required for street widening. Assuming There are two basic funding sources for the project. project could be.funded through Federal HBRR money. priority based on bridge rating. Review of the current priority listing indicates that the bridge rating for the Agua Hedionda Bridge is such that HBRR funding would be available October 1, 1981. Plans and specifications are also eligible for fund- ing from HBRR money and could be applied for under the October 1 , 1981 allocation. The City staff initiated the process for application for HBRR funds through a Field Review with State and Federal officials on October 17, 1979. At the Field Review, the City received an indication from the Federal representative that it would be advantageous to have plans and specifications prepared prior to October 1981. The Federal representative pointed out that design and environmental reports could be prepared using Federal highway funds which could later be replaced by HBRR funds. Under the Federal Aid Urban Program for funding of highway projects, the City of Carlsbad has $62,999 remaining in 1976 Act funds and $74,475 remaining in 1978 project funds. Both amounts are designated for miscellaneous improvements to the City's FAU system. The bridge portion of the Funding from HBRR is set by Assuming Counci 1 approves , I would 1 i ke to request that the San Diego Region Federal Aid Urban Advisory Committee authorize the use of this $137,474 for design of the bridge replacement. Assuming that we are granted HBRR funds in 1981, the FAU funds could be replaced. The Council may also be interested in knowing that HBRR funds require a 20% local match, while FAU funds require a 10% match. The 1979 Capital Improvement Program shows $50,000 for design of the bridge replacement. successful in obtaining FAU funds, only about $15,000 of the budgeted CIP funds woul d be requi red. If we are LE:mmt E