Levees / Sponsors / Contra Costa County Flood Control and Water Conservation District, Contra Costa County Public Works
Contra Costa County Flood Control and Water Conservation District, Contra Costa County Public Works
Named on the federal register as responsible for 4 levee systems in California, with 4,906 people recorded in the leveed areas.
Systems
4
on the register
People behind them
4,906
across 4 that publish it
Not enrolled
0
outside PL 84-99
No inspection rating
0
none published
01
Systems
4 records| System | Location | Accreditation | Programme | People | Length |
|---|---|---|---|---|---|
| Walnut Creek - Grayson Creek, right bank | Pacheco, Contra Costa County, California | Non-Accredited | Active | 2,375 | 2.88 miles |
| Walnut Creek - Clayton Valley Drain, left bank | Concord, Contra Costa County, California | Non-Accredited | Active | 1,365 | 1.68 miles |
| Walnut Creek - Grayson Creek, left bank | Vine Hill, Contra Costa County, California | Non-Accredited | Active | 638 | 1.49 miles |
| Walnut Creek - Clayton Valley Drain, right bank | Concord, Contra Costa County, California | Non-Accredited | Active | 528 | 0.56 miles |
Source: USACE National Levee Database, refreshed 2026-09-10.