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<br />Bridge t <br /> <br />Date <br /> <br />I <br />I <br />'- <br />I <br />I <br />I <br />I <br />I <br />I <br />( I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />EXHIBIT V-B, 2 of 2 <br /> <br />B. Bridge Closure. <br />1. Responsibility for decision. <br />2. Criteria for closure. <br />a. Water surface elevation. <br />b. Measured scour depth. <br />c. Warning signs of bridge failure. <br />3. Duration of closure. <br />4. Detour route. <br />a. Route <br />b. Length: <br />c. Other bridges on detour route. <br />1) Bridge Numbers: <br />2) On same waterway. <br />3) Condition. <br />4) Checked for scour potential. <br />c. Traffic <br />1) ADT: <br />2) Percent of trucks: <br />3) Residential neighborhoods along route. <br />d. Approval of detour plan by appropriate jurisdiction(s). <br />5. Feasibility of setting up detour <br />a. Necessary manpower. <br />b. Availibility of required traffic control equipment. <br /> <br />C. Scour Countermeasures. <br />1. Riprap <br />a. Size, extent and volume. <br />b. Estimated cost. <br />c. Time to design and construct. <br />2. Structural medifications to bridge. <br />a. Redundancy to structure <br />b. Cost <br />c. Timing of design and implementation. <br />3. Increase priority in replacement schedule. <br />4. Other possible countermeasures. <br />a. Piling <br />b. Channel training <br />c. Check dam <br />5. Source of funds. <br /> <br />B-22 <br />