1. 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…

2. 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

3. Stream Xing Replacement Policy
Road-Stream Interface
Stream Xing Replacement Policy
PSU Center for Dirt and Gravel Road Studies:
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.

4. Stream Xing Replacement Policy
Road-Stream Interface
Stream Xing Replacement Policy
PSU Center for Dirt and Gravel Road Studies:
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.