Sonoma Aqueduct Creek Crossings Vegetation Management Project (Project)


SCH Number
Lead Agency
Sonoma County Water Agency
Document Title
Sonoma Aqueduct Creek Crossings Vegetation Management Project (Project)
Document Type
NOE - Notice of Exemption
Project Applicant
Sonoma County Water Agency

Document Description
The Sonoma Aqueduct (Aqueduct) is the primary source of drinking water for customers of the Valley of the Moon Water District and City of Sonoma. Sonoma Water maintains a facility easement along the approximately 16-mile long Aqueduct pipeline. Though mostly underground, the Aqueduct includes aboveground sections at the three channel crossing sites (described above) that are susceptible to damage by falling trees. Failure of the Aqueduct would be of critical public health and safety concern. This project would manage existing trees within the easement that could potentially damage the Aqueduct due to their proximity, size and flammability. The project would include the removal and pruning of up to 20 native trees (alder, ash, bay, box eIder, oak, willow) ranging in size from approximately 4- to 30-inch diameter at breast height (DBH) and 5 non-native eucalyptus trees ranging in size from approximately 30- to 60-inch DBH. Follow-up vegetation management, as well as the removal of downed wooy material, would be conducted as needed to maintain access and clearance. No heavy equipment would would enter the active channel. Tree stumps and root structures would be left in place to avoid ground disturbance. Cut stumps may be treated with herbicide approved for use near water to prevent regrowth. Cut material would be mulched onsite or hauled offsite.

Contact Information
Candace Messner
Sonoma County Water Agency
404 Aviation Blvd
Santa Rosa, CA 95403

Phone : (707) 524-6424


38°25'6.2"N 122°33'40.8"W
Other Location Info
Sonoma County Water Agency's (Sonoma Water's) Sonoma Aqueduct channel crossings at three sites: 1) over Sonoma Creek in Kenwood near Turtle Creek Drive (Latitude/Longitude 38.4183991 - 122.561337): 2) over Sonoma Creek in Eldridge near Madrone Road (38.338162, -122.50498); and 3) over an unnamed seasonal creek in Eldridge near Loma Vista Drive (38.33022, -122.505138). Please see attached Figure 1.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Section 15301, Class 1 (b): Existing Facilities.
Reasons for Exemption
The project would consist of pruning and removing trees that present a hazard to the Aqueduct and involves no expansion of use. The project would. involve the pruning and ·removal of select vegetation for the .purpose· of protecting and maintaining .the Aqueduct' pipeline to deliver safe and reliable drinking water to the people and businesses Sonoma Water's Valley of the Moon water District and city of Sonoma service areas. The vegetation pruning and removal would be limited to three isolated narrow lengths of channel and would. not cause significant impacts to shade.over the channel or to the surrounding riparian corridor. Rem?val would reduce the volume of flammable non-native vegetation in the project area, and is anticipated to help promote native tree recruitment and establishment onsite. No work would be conducted in the water and the project would not cause ground disturbance. This maintenance project is exempt under CEQA Guidelines, Section· 153011 Class 1 (b): Existing Facilities because the Aqueduct is public facility and the proposed project involves no expansion of use.


Notice of Exemption
2019088049   PDF 1206 K 2019088049 attach 2   PDF 533 K 2019088049 map   PDF 1604 K

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