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Updated May 15, 2025
NOTICE : Public Comment period extended to Dec. 31 Marin Water has extended the public comment period for the proposed Nicasio Spillway Modification Project’s environmental review scoping process to 5 p.m. Dec. 31, 2025 (the public comment period for scoping was previously scheduled to end Aug. 4). The extension will allow more time to obtain suggestions and information from agencies and the public on the content and scope of issues to consider in developing the proposed project’s Environmental Impact Report, which Marin Water is initiating work on, pursuant to the California Environmental Quality Act. This webpage has been updated to reflect the changes in the public comment period schedule. |
Pursuant to the California Environmental Quality Act, Marin Water is initiating the environmental review of the Nicasio Spillway Modification Project. Modifying Nicasio Reservoir’s spillway is one of the near-term storage enlargement projects identified through development of the District's Water Supply Roadmap.
The reservoir's current storage capacity is 22,340 acre-feet. This project would install a 280-foot-long, 4.4-foot-high inflatable rubber gate spanning the width of the existing spillway crest of Seeger Dam. The modification to the existing spillway would provide approximately 3,700 acre-feet of additional temporary water storage capacity. The Project would increase locally stored water supplies in the near-term to reduce adverse effects on Marin Water customers caused by water shortages from droughts and other emergencies.
The review process begins with a comment period for agencies and the public to comment on the scope of the environmental review, including the project description, environmental issues to be analyzed and potential alternatives. These issues are described in a Notice of Preparation.
Comment Period
The public comment period will be open from April 30, 2025 to 5 p.m. on Wednesday, Dec. 31 2025. Comments must be submitted before the deadline and may be provided in one of the following ways:
- By email to:
Elysha Irish
eirish@marinwater.org
Subject: Nicasio Spillway Modification Project public comment
- By U.S. postal mail to:
Marin Water
Attention: Elysha Irish
220 Nellen Ave.
Corte Madera, CA 94925
Scoping Meetings
As part of the environmental review process, Marin Water held three public scoping meetings. The meetings were an opportunity for interested parties to learn more about the project and provide comments. The information presented was the same for all three meetings.
Scoping Meeting 1 Scoping Meeting #1 Video Recording
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Scoping Meeting 2 Scoping Meeting #2 Video Recording
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Scoping Meeting 3 |
Project Information and Background
Read the proposed project description and background on the Nicasio Spillway Modification Project page.