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General Authorization for Removing and Disposing of Sediment behind Tidegates
To be eligible for the General Authorization, the project must be for the purpose of disposal of sediments within waters of the state (e.g. wetlands) removed as a result of ditch maintenance/cleaning in drainage ditches upstream of tidegates and must meet the following criteria:
 The removal of sediments from drainage ditches shall be kept to the minimum amount necessary to remove recently deposited materials. Additional channel widening or deepening beyond that amount is not allowed. Sediment removed from drainage ditches may be spread in a thin layer (three inches or less) on farmed wetland or wet pasture, provided the impacts are temporary and there is no permanent conversion from wetland to upland. Freshwater wetland (other than farmed wetland or wet pasture mentioned above), salt marsh, tidal flats or permanent or semi-permanent open water areas shall not be used for sediment disposal.
- Removal of existing woody vegetation, other than that growing within the maintained channel bed is prohibited.
- Only sand and silt sediments may be removed. This authorization is not for the removal of gravel.
- Removal shall be conducted with land-based equipment from one side of the drainage ditch unless specifically authorized by the Agency.
- Erosion of disturbed areas shall be minimized through re-vegetation.
For a more detailed description of additional eligibility and mandatory requirements, consult OAR 141-089-0285.
If you have further questions about a specific project, contact the DSL Resource Coordinator for your county.
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