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Maintenance access is available presently along Clear Creek via 10th and 11th Streets with access points at Cheyenne Street, Illinois Street, along L ions Park and at the campground near the water treatment pl ant. Access should be improved by the construction of the long term channel which incor- porates a 10-foot wide maintenance access trail to double as a recreational hiker/biker trail. C-3 COMMENTARY ON SHEET 1 Reac h 1 Station 900+00 to Station 955+00 The two fold flood hazard mitigation strate9Y for Reach 1 is illustrated on Sheet 1 at right. Under the long term pl an a 100-year capacity grass-l ined channel should be constructed between Tucker Gulch and the water treatment pl ant along with bridge improvements at Ford Street and Washington Avenue (shown on Sheet 2). This plan effectively reduces the flood hazard by con- fining the 100-year flow within the channel area and reducing the backwater effects at Ford Street and Washington Avenue. In addition, the plan pro- vides recreational open space in the form of a linear park along Clear Creek with a pedestrian/bicycle transportation 1 ink to the proposed Tucker Gulch trail and the Denver Metro Regional Trail System. The typical improved channel section is shown on Sheet 7. COST EST! MA TE Reach 1 Station 90U+00 to Station 955+00 CONSTRUCTION - LONG TERM PLAN Channel Improvement Costs Channel Crossing Costs Utility Relocation Costs TOTAL CONSTRUCTION COSTS ENGINEERING AND CONTINGENCIES (30% of Construction Costs) FISCAL, LEGAL ~ND ADMINISTRATIVE (10% of Above Total) PROPERTY ACQUISITION COSTS Since the long term plan would be implemented over an extended period of time as land and funds become available, an interim plan has been adopted under which immediate remedial improvements will be made to reduce flood damages at key areas. Floodproofing measures should be implemented at the Municipal Building, Library, Recreation Center, Water Treatment Plant and Mitchell School Buildings (shown on Sheet 2). A landscaped berm should be placed along Maple Street between 9th and 10th Streets to divert initial overflows southward toward the creek. Ri prap and overflow protect i on need to be installed at the Water Treatment Plant berm downstream of U.S. 6 to prevent loss of the berm and raw water pond by high velocity flood flows. The Interim Plan also includes suggested participation in the Federal Flood Insurance Program and encouragement of owner floodproofing measures for the pri vate sector. TOTAL IMPROVEMENT COSTS (1982) MAINTENANCE - LONG TERM PLAN Annual Operation/Maintenance Cost CONSTRUCTION - INTERIM PLAN Floodproofing Measures WTP Berm Protection Maple Street Berm Flood Awareness/Flood Emergency Plan TOTAL CONSTRUCTION COSTS ENGINEERING AND CONTINGENCIES (30% of Const. Costs) FISCAL, LEGAL AND ADMINISTRATIVE (10% of Above Total) PROPERTY ACQUISITION COSTS It is further recommended that the City of Golden and Jefferson County commit the funds necessary to participate in a flood warning system for Cl ear Cree k . TOTAL IMPROVEMENT COSTS (1982) INTERIM PLAN MAINTENANCE - INTERIM PLAN Annual Operation/Maintenance Cost $ 338,000.00 $ -0- $ 15,000.00 $ 353,000.00 $ 105,900.00 $ 45,900.00 $1,015,500.00 $1,520,300.00 I I I I I I I I I I I I I I I I I I I $ 20,350.00 $ 80,000.00 $ 150,000.00 $ 10,000.00 $ 25,000.00 $ 265,000.00 $ 79,500.00 $ 34,500.00 $ -0- $ 379,000.00 $ 20,350.00