Stream channel conditions, including expected flow rates during the operation of the temporary crossing, should be thoroughly evaluated before choosing the appropriate type of stream crossing. Select crossing sites away from trees, steep banks, channel bends, areas with high stream gradient, areas with more erodible bank and bed material, and deep pools. Temporary stream crossings should be limited to locations with low erosion potential and constructed during dry periods to minimize stream disturbance and reduce costs.
In general, temporary stream crossings are applicable when heavy equipment must be moved from one side of a watercourse to the other, or where lighter-duty construction vehicles require frequent, short-term access for crossing a stream channel. Refer to Planning considerations for additional discussion. The primary function of a temporary stream crossing is to prevent construction equipment from damaging the stream bed and banks, impeding stream flow, blocking fish migration, and tracking sediment and other pollutants into the stream.īecause of the potential disturbance created by construction of a temporary stream crossing, they should be used only when they are completely necessary for construction purposes.
6 Construction recommendations and specifications.
