Shenson v. County of Contra Costa
Annotate this Case
In the 1970s-1980s, the County approved maps for two subdivisions bordered by a tributary of “Murderer’s Creek.” The creek is a natural watercourse that is the main receptacle for storm runoff emanating from the watershed above the properties and is the only reasonable means of collecting and conveying that runoff. Pursuant to the Subdivision Map Act, the County required the developers to make drainage improvements to collect and convey water from the subdivisions to the creek. Contributing to runoff were two private roads serving as ingress and egress to the subdivisions and one county-owned road. adjacent to one subdivision. As provided by the Map Act, the County required the developers to dedicate drainage easements to the County. When it approved the subdivision maps, however, the County did not accept the offers of dedication. The drainage improvements remained in the ownership of the developers and later the homeowners.
The owners bought lots in those subdivisions in 2010 and 2016. They sued the County and a flood control district for inverse condemnation and tort claims after drainage improvements constructed more than 40 years earlier failed and serious erosion and subsidence damaged their properties. The superior court rejected the suit on summary judgment. The court of appeal affirmed. As a matter of law, a public entity must either own or exercise actual control over a waterway or drainage improvements to render them public works for which the public entity is responsible.
Some case metadata and case summaries were written with the help of AI, which can produce inaccuracies. You should read the full case before relying on it for legal research purposes.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.