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COVID-19 Updates: Get the latest public information related to coronavirus disease 2019 (COVID-19) at

Public Works will re-open our front counter to the public on July 6 and start providing some modified services.  Our hours will be 8 – 5, with closure from 12 – 1:30 for sanitation. Masks are mandatory in our building, and we ask that you adhere to physical distancing protocol. We will have limited services at our front counter and will not be accepting drop in meetings.  Please contact 805-781-5252 to make an appointment with staff.  Bus passes can be purchased at the Kiosk on the corner of Osos and Palm or by phone via Follow us on Twitter @SLOCountyPWD for the latest updates.

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Public Works

County of San Luis Obispo


Adelaida Area Hydrogeologic Study

The San Luis Obispo County Flood Control and Water Conservation District is coordinating with the U.S. Geological Survey (USGS) and the Upper Salinas-Las Tablas Resource Conservation District (RCD) to conduct a groundwater study in the Adelaida area west of the City of Paso Robles (click here to view an interactive map of the preliminary study area). The goal of this study is to provide a better understanding of the groundwater conditions in the Adelaida area so that informed decisions can be made about managing local water resources.

Please visit the links below for additional information.

Animal Services Facility

New animal services facility to be constructed at the County Operations Center off Highway 1. The County Board of Supervisors awarded the Design-Build contract for the County’s new animal services facility project to F&H Construction. The new facility will replace the outdated 43-year old public animal shelter that has deteriorated beyond repair.

This project was authorized as a joint effort between the County and Cities of Atascadero, Arroyo Grande, Grover Beach, Morro Bay, Paso Robles, Pismo Beach, and San Luis Obispo. When complete, the new facility will meet the community’s needs by providing an inviting facility for pet adoptions and allow for the humane care of sheltered animals decades into the future.

Avila Beach Drive at Highway 101 Interchange

Reconfigure the US 101 and Avila Beach Drive Interchange to reduce delay.

Cayucos Vets Hall Restoration

This project will stabilize, rehabilitate and restore the Cayucos Veterans Memorial Building (also known as the historic Cass Warehouse) at Cayucos State Beach and create a safe and usable facility for community activities. As a historic building that meets the criteria required for listing in the California Register of Historical Resources,the design for the rehabilitation will follow the Secretary of the Interior Standards for the restoration of historic buildings.

Co-Located Dispatch Facility

The County of San Luis Obispo is in the process of designing and constructing a new Co-Located Dispatch Facility. The Co-Located Dispatch will be located at the County Operations Center off Highway 1. When complete, the facility will replace two antiquated and overcrowded dispatch centers with an efficient, state-of-the-art facility that is able to meet Cal Fire/SLO County Fire and Sheriff Dispatch growing emergency service response needs.

Figure 1 below shows a conceptual layout of the Co-Located Dispatch Facility Site Plan.


El Camino Real Bridge Replacement Project, Santa Margarita

The project proposes replacing the existing bridge on El Camino Real over the Santa Margarita Creek with a new cast in place, concrete slab bridge.

Los Osos Wastewater Project

Evaluation and development of a wastewater treatment system for Los Osos, CA.

Main Street at Highway 101 Interchange in Templeton

Reconfiguration of the US 101 and Main Street Interchange in the community of Templeton.

Mid-Higuera Bypass Project

The Mid-Higuera Bypass Project is proposed to increase the flood control capacity of the San Luis Obispo Creek between Marsh Street and Madonna Road.

Nacimiento Water Project

One of the largest value projects the County has ever completed, the Nacimiento Water Project began operations in 2011 after the construction of the $176 million, 45-mile pipeline from Lake Nacimiento to San Luis Obispo was completed. Today County staff oversee the operations and management of the pipeline.

New Probation Department Building

The Board of Supervisors has approved the construction of a New Probation Department Building.  The new building will replace the Probation Department’s main office in San Luis Obispo on Bishop Street, referred to as Casa Loma.   The Casa Loma facility was built in 1940, is in need of constant repair, short on space and ill-suited for today’s Probation Department needs.  The new facility will be a state-of-the-art facility that will meet the Probation Department’s needs for decades to come.

Oak Shores Wastewater Treatment Facility Upgrade

This project includes improvements to increase system capacity, provide nitrogen removal, increase flow capacity, and upgrade the collection system for the community of Oak Shores.

Oceano Drainage Improvement Project

This project is to construct drainage improvements to alleviate existing drainage issues in the town of Oceano at Highway 1.

Paso Basin Aerial Groundwater Mapping Pilot Study

Our community needs a more complete picture of our groundwater resources so that we can make better decisions about managing water into the future. The County of San Luis Obispo was fortunate enough to be among three agencies selected for a pilot study to collect groundwater data in a portion of the Paso Robles Basin (click for map of study area). This pilot study is using innovative technology that could change the way that California collects information about groundwater basins.

What would normally take the County years to survey will only take a few days thanks to new aerial groundwater mapping technology called Aerial Electromagnetic method (AEM). 

Salinas Dam Disposition Study

Salinas Dam (forming Santa Margarita Lake) was built in 1941 under a military directive to supply water to Camp San Luis Obispo to support training needs for the Army during World War II.  Due to this, the dam does not have a Civil Works Authority nor is it authorized for any flood risk management purposes.  Shortly after it was built, Camp San Luis Obispo was no longer an active military facility, and the military transferred ownership to the Army Corps of Engineers (USACE) in 1955.  USACE subsequently leased the facility to the San Luis Obispo County Flood Control and Water Conservation District (District) to operate the dam to provide water supply for the City of San Luis Obispo (City).  The City has existing water rights for 45,000 acre-feet of storage, however current storage capacity is 23,843 acre-feet because the gate in the spillway was not installed as planned during construction due to structural concerns (indicated by arrow).  Transferring ownership and putting in the gate is identified as an opportunity for securing additional water supplies to address needs in San Luis Obispo County in the County-wide Master Water Report.


A USACE Disposition Study has been funded and is being coordinated by the Los Angeles office with the District and the City.  If disposition to the District from the USACE is feasible, local ownership is intended to ensure long-term security of a critical local water supply and facilitate opportunities for additional supply to the Paso Robles Groundwater Basin, designated as in critical overdraft by the State.  It is anticipated that funding partnerships would be sought to help with any costs associated with transferring the dam to local ownership and installing the gates for increased water supply. 

State Route 227 and Los Ranchos Road Intersection Operational Improvements Project

The County of San Luis Obispo is in the preliminary engineering phase of a project to improve operations at the State Route 227 and Los Ranchos Road intersections. In order to determine the best solution at this intersection, the County is working on a detailed traffic analysis of the State Route 227 corridor from Aero Drive to Price Canyon Road.



Tefft Street at Highway 101 Interchange

Reconfiguration the US 101 and Tefft Street Interchange to reduce delay on Tefft Street.

Winter Cloud Seeding Program for Lopez Lake

The County of San Luis Obispo Flood Control and Water Conservation District (District) is proposing a Winter Cloud Seeding Program for Lopez Lake (project). The project objective is to increase precipitation in the Lopez Lake watershed during winter precipitation events. The seeding program would use a combination of approximately eight ground-seeding sites and aircraft.