Oregon Administrative Rules › Chapter 141 - DEPARTMENT OF STATE LANDS › Division 89 - ADMINISTRATIVE RULES GOVERNING THE ISSUANCE AND ENFORCEMENT OF GENERAL AUTHORIZATIONS WITHIN WATERS OF THIS STATE › Section 141-089-0810 - Wetland Ecosystem Restoration - Authorized Activities

Current through Register Vol. 63, No. 7, July 1, 2024
The following activities are allowed under this general
				authorization:
(1) Vegetation
			 Management. Ground-altering activities needed to re-establish and maintain
			 native vegetation, such as mechanized land clearing to remove non-native
			 vegetation and disking for seedbed preparation and planting of native wetland
			 species.
(2) Floodplain Contouring.
			 Floodplain contouring of wetland terraces to reconnect a waterway to an
			 adjacent wetland or expand the area of seasonal inundation. This activity does
			 not include modification of a stream channel.
(3) Microtopography Establishment. Grading
			 and contouring to re-establish microtopography (hummocks, minor ridges, very
			 shallow depressions) in areas that have been previously leveled, scalped or
			 otherwise disturbed to eliminate pre-existing microtopography. Activity is
			 limited to six-inch maximum elevation rise or drop.
(4) Macrotopography Establishment. Shallow
			 excavation to create scrapes, basins, meanders and swales that do not exceed
			 two feet in depth from existing or original ground surface and have minimum
			 side slopes of 6:1 or gentler. If shallow excavation is combined with berm
			 construction described in Section 6 of this rule, the maximum depth of
			 inundation must not exceed two feet.
(5) Removal of Materials. Removal of soil or
			 other materials that have been placed in a wetland for the purpose of restoring
			 the natural and/or historical topography.
(6) Low Earthen Berms and Spillways.
			 Construction of low earthen berms and vegetated spillways that impede, contain
			 or direct surface water may be used to extend the area or duration of shallow
			 inundation. The design height of the berms must be no more than 18 inches from
			 the existing ground level and have a maximum top width of four feet, variable
			 slopes at a minimum of 6:1 or gentler on the water side, and maximum slopes of
			 6:1 on the land side, unless gentler slopes do not result in the conversion of
			 wetland to upland. These structures may be installed to manipulate seasonal
			 water depth, duration and degree of fluctuation that would be characteristic of
			 natural or historical hydrologic conditions and to manage invasive species.
			 When berms are combined with shallow excavation described in Section (4) of
			 this rule, the maximum depth of inundation must not exceed two feet.
(7) Removal of Structures. Removal of
			 diversion structures, water control structures, small (three feet high or less)
			 berms and tidegates, as long as the removal does not cause water to rise or be
			 redirected in such a manner to result in damage to structures or substantial
			 property.
Statutory/Other Authority: ORS 196.600 - 196.692 &
				  196.795 - 196.990
Statutes/Other Implemented: ORS 196.600 - 196.692 &
				  196.795 - 196.990