Road-Stream Interface:

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Presentation transcript:

Road-Stream Interface: Environmentally Sensitive Maintenance for Dirt & Gravel Roads This Section – Bank Management In this section we will focus on the management of road banks. Road-Stream Interface: Bankfull is Step One…

Stream Xing Replacement Policy Road-Stream Interface Stream Xing Replacement Policy 141 Crossings replaced under new policy: 55 replaced in 2015 86 replaced in 2016 Projects by structure type: 45 Round pipes 31 Squash pipes 14 Plate Arch spans 11 box culverts 5 bottomless arch 2 GRS-IBS bridges 2 other bridges

Stream Xing Replacement Policy Road-Stream Interface Stream Xing Replacement Policy PSU Center for Dirt and Gravel Road Studies: www.dirtandgravelroads.org Stream crossings OVER 4’ dia. (13ft2) opening In order to be eligible for replacement, EXISTING structures must have: 1. A structure to bankfull width ratio of 75% or less. 2. Signs of stream bank erosion. 3. Streambed erosion/aggradation. Automatically Eligible for Replacement: Multiple Pipes Stream Crossings UNDER 4’ diameter (13ft2) opening.

Stream Xing Replacement Policy Road-Stream Interface Stream Xing Replacement Policy PSU Center for Dirt and Gravel Road Studies: www.dirtandgravelroads.org Replacement Structure The NEW REPLACEMENT structure must (all four): Have a structure width at least equal to bankfull width (100% ratio). 2. Be properly aligned with the channel, when possible. 3. Consider additional floodplain connectivity when possible. 4. Be designed and constructed to accommodate the passage of aquatic organisms through the structure.