Watmaugh Road Bridge Over Sonoma Creek Replacement Project (California Endangered Species Act Incidental Take Permit No. 2081-2023-006-03 (ITP))
6 Documents in Project
Summary
SCH Number
2012082037
Lead Agency
Sonoma County
Document Title
Watmaugh Road Bridge Over Sonoma Creek Replacement Project (California Endangered Species Act Incidental Take Permit No. 2081-2023-006-03 (ITP))
Document Type
NOD - Notice of Determination
Received
Posted
3/16/2026
Document Description
The California Department of Fish and Wildlife (CDFW) has issued an ITP (No. 2081-2023-006-03), pursuant to Section 2081(b) of the Fish and Game Code to Sonoma Public Infrastructure.
The Project includes demolition of the existing three-span bridge over Sonoma Creek and replacement with a new three-span pre-stressed concrete bridge in the same location and alignment that will measure 180 feet long and 32 feet wide. Cast in Drilled Hole (CIDH) concrete piles will be drilled at the top of banks of the creek at the location of the new abutments, and within the channel of Sonoma Creek at the new pier locations. The new bridge structure will consist of a concrete box girder. A new concrete bridge deck will be cast in place. Approximately 0.08 acres of new rock slope protection will be added to protect abutments on the upper banks of Sonoma Creek and outside of the wetted channel. Access will be from the northeast side of the bridge and require grading a temporary access road from the top of the bank down to the creek bed.
A temporary gravel work pad within the creek channel will be needed to construct the necessary false work and dismantle the existing bridge. The temporary gravel work pad will be constructed across the channel of Sonoma Creek and cover approximately 0.10 acres. To isolate the work area prior to construction of the temporary gravel work pad, the creek will be temporarily dewatered and diverted into culverts for the Project duration. Construction within the dewatered portion of Sonoma Creek will be completed within one season from June 15 through October 15.
The Project will result in impacts to 120 linear feet (0.08 acres) of California freshwater shrimp (Syncaris pacifica) habitat including temporary impacts to 120 linear feet (0.08 acres) from dewatering; the Project will permanently remove 112 square feet of aquatic habitat for California freshwater shrimp from installation of new pier footings within Sonoma Creek, however removal of 250 square feet of existing pier footings from aquatic habitat within Sonoma Creek will result in a net decrease of 138 square feet of permanent impacts to aquatic habitat for California freshwater shrimp. The Project will also result in temporary impacts to 0.06 acres of overhanging riparian habitat for California freshwater shrimp located above the wetted portion of Sonoma Creek during Project construction, within the same length of stream that will be dewatered. The Project is expected to result in incidental take of California freshwater shrimp, which is designated as an endangered species under the California Endangered Species Act (CESA). The ITP referenced above as issued by CDFW authorizes incidental take of species listed under CESA that may occur as a result of Project implementation.
Contact Information
Name
James Hansen
Agency Name
CA Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Responsible Agency
Phone
Name
David Walsh
Agency Name
Sonoma County PRMD
Job Title
Environmental Project Manager
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Sonoma
Counties
Sonoma
Regions
San Francisco Bay Area
Township
5N
Range
6W
Section
24
Other Location Info
The Project is located where Watmaugh Road crosses Sonoma Creek, south of the City of Sonoma, in an unincorporated area of the County of Sonoma. The Project is located approximately 0.3 miles west of the intersection of Watmaugh Road and State Route 12/Broadway at approximately 38.26573°N, -122.46735°W. Sonoma Creek runs from north to south at the Project site. The Project site is bounded by residential development to the east and active agricultural land to the west. The Project is located within the Sonoma U.S. Geological Survey 7.5 Minute topographic quadrangle map and in Section 24 of Township 5 North, Range 6 West.
Notice of Determination
Approving Agency
CA Department of Fish and Wildlife
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Sonoma
Final Environmental Document Available at
The environmental impact report prepared by the lead agency for the Project is available to the general public at the office location listed above for the lead agency. CDFW’s administrative record of proceedings related to the incidental take permit is available to the public for review at CDFW’s regional office.
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
Yes
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(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
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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