Water Quality Certification Public Notices
Water Quality Certification Actions - Applicants for federal permits that involve dredge or fill activities in surface waters (including wetlands) are required to obtain certification from the state verifying that the activity will comply with state water quality standards. Most of these federal permits are referred to as 404 permits (in reference to Section 404 of the federal Clean Water Act). Applicants for some other types of federal license or permits (ex. FERC licenses) that authorize activities that may result in discharges to waters of the United States are also required to obtain state certification. This state certification is called 401 Certification (in reference to Section 401 of the Clean Water Act). In California, 401 certification actions are the responsibility of the State and Regional Water Quality Control Boards. It is the policy of this Regional Board to provide public notice of pending 401 Certification actions in order to gather comments from concerned agencies and the public. The following list contains notification of pending 401 Certification actions.
| Project Name | WDID | County | Location | Description | Comment period | Contact Info |
|---|---|---|---|---|---|---|
| California Department of Transportation CDOT Highway 96 PM 26.05, 61.47, & 81.84 Oak Bar Culverts II (02-1K810) |
1A25147WNSI | Siskiyou | PM 26.05 PM 61.47 PM 81.84 |
The project will improve drainage facilities along SR 96 by replacing three jurisdictional culverts postmiles (PMs) 26.05, 61.47, and 81.84, including improved end treatments at culvert inlets and placing rock slope protection (RSP) at the outlets. Temporary impacts to streams of 236 linear feet (LF) (0.0108 acres) will result due to culvert replacement, and 60.60 LF (0.0028 acre) of permanent impacts will occur due to RSP, end treatments, and extending a culvert. The culvert diameters will be upsized for a total of 233 LF and this will fully offset the permanent impacts. Any disturbed soil or vegetation will be stabilized or re-established per the erosion control plan. Diversion and dewatering plans will be submitted when applicable. Construction will be scheduled over 40 working days from approximately April 29 to June 24, 2026. | October 28, 2025 through November 11, 2025 | Susan Stewart Susan.Stewart@waterboards.ca.gov 707-576-2657 |
| California Department of Transportation CDOT Highway 101 PM 39.8 – 40.4 Ridgewood Grade Safety Project (01-0L380) |
1B25142WNME | Mendocino | PM 39.72 PM 39.77 PM 39.84 PM 39.97 PM 40.11 PM 40.21 |
The Project will increase inside and outside shoulder widths on both sides of the 4-lane divided expressway to reduce collisions. The Project will create four maintenance vehicle pullouts, replace the median barrier, and install new shoulder rumble strips and high friction surface treatment on curves. Work will include construction a new roadway section, pavement delineation, guardrail reconstruction, extension or replacement of six jurisdictional culverts, and installation of an underdrain parallel to the NB lane that spans three postmiles (PMs). The Project will result in temporary impacts of 239.1 linear feet (LF) to streams and 0.0551 acres to riparian areas. Permanent impacts will include 0.1492 acres of wetland, 252.1 linear feet (LF) to streams and 0.0666 acres to riparian areas. Culvert upsizing and daylighting will offset 77.6 LF of stream impacts onsite. Due to the lack of suitable restoration areas within the project limits, mitigation for the remaining temporary and permanent impacts would occur through offsite mitigation at the Jacobs Parcel adjacent to the Willits Bypass Mitigation Lands near Willits. Construction is planned to occur over approximately 135 working days in 2027. | October 22, 2025 through November 12, 2025 | Susan Stewart Susan.Stewart@waterboards.ca.gov 707-576-2657 |
