General Authorization for Streambank Stabilization
To be eligible for the General Authorization for Streambank Stabilization, a project must:
The project also must meet the following mandatory requirements:
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Stream bank stabilization through use of logs and natural plantings. Photo courtesy NRCS, Gary Wilson.
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Involve no more than 1,000 cubic yards of material placed in a 1/4 mile reach of a stream or more than 2,000 cubic yards for multiple-related projects within a subbasin.Where structural techniques are unavailable, the project shall include a nonstructural component such as slope pull-back, willow mats, rock barbs, re-vegetation with native plant species and log and boulder deflectors to the maximum extent possible.
Where revetments, riprap and/or any other hard structural techniques are unavoidable, they shall be used in combination with nonstructural or bio-engineered approaches to streambank stabilization.
Only clean, durable rock shall be used as riprap. Riprap used for the toe material shall be placed in an irregular pattern using large boulders or rock clusters.
No material shall be removed in excess of the amount required to construct a toe trench, key material to the bank, or slope the bank.
No material shall be placed in excess of the minimum needed to stabilize the area subject to active erosion.
The following projects are NOT eligible for this authorization:
Projects involving channel relocation or gravel bar alteration
Projects consisting entirely of structural stabilization methods (e.g., rip-rap, bulkheads)
Projects involving fill in wetlands exceeding 0.2 acres.
For a more detailed description of additional eligibility and mandatory requirements, consult OAR 141-089-0140.
If you have further questions about a specific project, contact the DSL Resource Coordinator for your county.
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