Temporary Stream Crossing (TSC)
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1 Temporary Stream Crossing (TSC) SM-10 Description Where an actively flowing watercourse must be crossed regularly by construction vehicles, a temporary crossing should be provided. Three primary methods are available: Culvert crossing Stream ford Temporary bridge Culvert crossings and fords are the most commonly used methods. Due to the expense associated with a temporary bridge, these are used primarily on longterm projects. Photograph TSC-1. A temporary stream crossing using culverts. Photo courtesy of Tom Gore. Appropriate Uses Construction vehicles shall be kept out of waterways to the maximum extent practicable. Use a temporary stream crossing when it is absolutely necessary to cross a stream on a construction site. Construct a temporary crossing even if the stream or drainageway is typically dry. Multiple stream crossings should be avoided to minimize environmental impacts. A permit is required for placement of fill in a waterway under Section 404 of the Clean Water Act. The local office of the U.S. Army Corps of Engineers (USACE) should be contacted concerning the requirements for obtaining a 404 permit. In addition, a permit from the U.S. Fish and Wildlife Service (USFWS) may be needed if endangered species are of concern in the work area. Typically, the USFWS issues are addressed by a 404 permit, if one is required. The municipality of jurisdiction should also be consulted, and can provide assistance. Other permits to be obtained may include a floodplain development permit from the local jurisdiction. Design and Installation Design details are provided for these types of stream crossings: TSC-1. Culvert Crossing TSC-2. Ford Crossing TSC-3. Flume Crossing Temporary Stream Crossing Functions Erosion Control Yes Sediment Control Yes Site/Material Management No June 2012 Urban Drainage and Flood Control District TSC-1
2 SM-10 Temporary Stream Crossing (TSC) A culvert crossing should be sized appropriately with consideration for the duration of construction and seasonal variation of flows. The sizing methodology provided in the Temporary Diversion Methods Fact Sheet is also appropriate for determining the design flow for temporary stream crossings. Culvert sizing must account for the headwater and tailwater controls to properly size the culvert. For additional discussion on design of box culverts and pipes, see the Major Drainage chapter in Volume 1. The designer also needs to confirm that the riprap selected is appropriate for the conditions in the channel being crossed. When a ford must be used, namely when a culvert is not practical or the best solution, the ford should be lined with at least a 12-inch thick layer of Type VL (D 50 = 6 inches) or Type L (D 50 = 9 inches) riprap with void spaces filed with 1-1/2 inch diameter rock. Ford crossings are recommended primarily for crossings of ephemeral (i.e. intermittently, briefly flowing) streams. For a temporary bridge crossing, consult with a structural and/or geotechnical engineer for temporary bridge design or consider pre-fabricated alternatives. Maintenance and Removal Inspect stream for bank erosion and in-stream degradation. If bank erosion is occurring, stabilize banks using erosion control practices such as erosion control blankets. If in-stream degradation is occurring, armor the culvert outlet(s) with riprap to dissipate energy. If sediment is accumulating upstream of the crossing, remove excess sediment as needed to maintain the functionality of the crossing. Remove the temporary crossing when it is no longer needed for construction. Take care to minimize the amount of sediment lost into the stream upon removal. Once the crossing has been removed, stabilize the stream banks with seed and erosion control blankets. TSC-2 Urban Drainage and Flood Control District June 2012
3 Temporary Stream Crossing (TSC) SM-10 June 2012 Urban Drainage and Flood Control District TSC-3
4 SM-10 Temporary Stream Crossing (TSC) TSC-4 Urban Drainage and Flood Control District June 2012
5 Temporary Stream Crossing (TSC) SM-10 June 2012 Urban Drainage and Flood Control District TSC-5
6 SM-10 Temporary Stream Crossing (TSC) TSC-6 Urban Drainage and Flood Control District June 2012
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