Ralph Tide Gate Project (Lake or Streambed Alteration Agreement No. 1600-2019-0406-R1)


SCH Number
Public Agency
California Department of Fish and Wildlife, Region 1E (CDFW)
Document Title
Ralph Tide Gate Project (Lake or Streambed Alteration Agreement No. 1600-2019-0406-R1)
Document Type
NOE - Notice of Exemption
Document Description
The project is limited to one (1) encroachment (Table 1) for the partial replacement of a culvert that is part of an existing tide gate structure in Mad River Slough. The outer (seaward) 20 feet of a 60-foot long, 18" diameter culvert will be replaced. The tide gate structure runs through a 12-foot wide agricultural dike and drains diked agricultural lands into the Mad River Slough. Work for this encroachment will include excavation, removal of the failing culvert section, replacement with a new properly sized culvert, back-filling and compaction of fill, and rock armoring as necessary to minimize erosion.

Contact Information

Andrew Orahoske
Agency Name
Department of Fish and Wildlife
Contact Types
Lead/Public Agency

Agency Name
C. John Ralph
Contact Types
Project Applicant


Other Location Info
The project to be completed is located within the Humboldt Bay watershed, approximately 3.4 miles west northwest of the town of Arcata, County of Humboldt, State of California. The project is located in Section 23, T06N, R01W, Humboldt Base and Meridian; in the Tyee City U.S. Geological Survey 7.5-minute quadrangle; Assessor's Parcel Number 506-281-007; latitude 40.8909 N and longitude 124.1395 W at the tide gate.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Reasons for Exemption
The project replaces an existing culvert with an appropriately sized culvert for an existing tide gate structure. There would be no significant adverse impact on endangered, rare or threatened species or their habitat pursuant to section 15065. There are no hazardous materials at or around the project site that may be disturbed or removed. The project would not constitute an expansion of use.


Notice of Exemption

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