Mendocino Coast TMDL Implementation Project - Phase 3, South Fork Big River Component Stream Crossings Project (Lake or Streambed Alteration Agreement No. EPIM

32 Documents in Project

Summary

SCH Number
2012052019
Lead Agency
Mendocino County Resource Conservation District
Document Title
Mendocino Coast TMDL Implementation Project - Phase 3, South Fork Big River Component Stream Crossings Project (Lake or Streambed Alteration Agreement No. EPIM
Document Type
NOD - Notice of Determination
Received
Posted
10/1/2025
Document Description
The California Department of Fish and Wildlife (CDFW) has executed Lake and Streambed Alteration Agreement ([EPIMS-MEN-49045-R1C), pursuant to Fish and Game Code section 1602, to the project Applicant, Joe Scriven, representing Mendocino Resource Conservation District. The Project is limited to six encroachments. All encroachments described below will follow the treatments described in the conceptual treatments document provided with the Notification materials. One proposed encroachment (SC #7) is to upgrade an existing unimproved low water crossing to a vented armored fill crossing. Work for this encroachment will include excavation, installation of 20 cubic yards of 0.5-1.5 foot diameter rock armor for a keyway, placement of a new properly sized culvert, installation of five cubic yards of 8-12 inch diameter rock for the driving surface rock, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. One proposed encroachment (SC #8) is to realign a diverted stream channel, install a stream crossing culvert, install a critical dip on the left hinge line of the crossing, and armor a knickpoint in the channel upstream of the crossing. Work for this encroachment will include excavation, placement of a new properly sized culvert, backfilling and compaction of fill, installation of ten cubic yards of 0.5-1.5 foot diameter rock into the knickpoint, and rock armoring as necessary to minimize erosion. One proposed encroachment (SC # 10) is to upgrade an existing culvert and install a critical dip on the left hinge line of the crossing. Related road work will also include adding five cubic yards of 0.5-1.0 foot diameter riprap to the right inboard ditch, installing a rolling dip up the right road, installing an 18-inch diameter ditch relief culvert (DRC) paired with the rolling dip, and clean/cut the inboard ditch approximately 300 feet up the right road to the existing DRC. Work for this encroachment will include excavation, removal of the existing culvert, removal of an old concrete culvert in the channel below the crossing, replacement with a new properly sized culvert, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. One proposed encroachment (SC #13) is to upgrade an existing culvert and install a critical dip on the left hinge line of the crossing that outlets into an existing gully. Work for this encroachment will include removal of a concrete apron around the inlet of the existing culvert, excavation, removal of the existing culvert, replacement with a new properly sized culvert, backfilling and compaction of imported fill, and rock armoring as necessary to minimize erosion. One proposed encroachment (SC #14) is to upgrade an existing culvert and install a critical dip on the left hinge line of the crossing. Related road work will also include installing a rolling dip up the right road to drain the road surface and installing an 18-inch diameter ditch relief culvert (DRC) paired with the rolling dip to drain the ponded area upslope of the road and to the right of the crossing. Work for this encroachment will include excavation, removal of the existing culvert, replacement with a new properly sized culvert, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. The final proposed encroachment (SC #15) is to upgrade an existing culvert, rock armor an outside bend in the stream channel upslope of the crossing with 5 cubic yards of 2.0-2.5 foot diameter rock, install 5 cubic yards of 2.0-2.5 foot rock armor as a grade control structure in the stream channel immediately upstream of the new culvert inlet, and install a critical dip on the right hinge line of the crossing. Work for this encroachment will include excavation, establishment of a 4-foot wide channel with 2:1 slopes above and below the crossing, removal of the existing culvert, replacement with a new properly sized culvert, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion.

Contact Information

Name
John Herrera
Agency Name
CA Fish and Wildlife
Job Title
Senior Environmental Scientist Specialist
Contact Types
Responsible Agency

Name
Joe Scriven
Agency Name
Mendocino County Resource Conservation District
Job Title
MCRCD Staff
Contact Types
Lead/Public Agency

Location

Cities
Comptche
Counties
Mendocino
Regions
Northern California
Cross Streets
approximately 6.9 miles east of the town of Comptche
Parcel #
149-050-11, 149-050-08, 149-050-03, 149-040-06, 149-030-08-05
Waterways
Big River watershed
Township
16N
Range
14W
Section
18, 19
Base
MtDiablo

Notice of Determination

Approving Agency
CA Fish and Wildlife
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Mendocino
Final Environmental Document Available at
Mendocino County Resource Conservation District 115 E. Smith Street Ukiah, CA 95482 Contact: Joe Scriven Email: joe.scriven@mcrcd.org Phone: 707-462-3664, ext. 104

Determinations

(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
No
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No

Attachments

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