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.
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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.
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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.
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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.
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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.
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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:
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Projects involving channel relocation or gravel bar alteration
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Projects consisting entirely of structural stabilization methods (e.g., rip-rap, bulkheads)
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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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