Crocker Diversion dam
Crocker Diversion
Crocker Diversion, located in Snelling, California, along the Merced River, was completed in 1910 with a primary purpose of flood risk reduction. This gravity dam stands at 22 feet high and has a storage capacity of 300 acre-feet. The dam plays a crucial role in irrigation, water supply, and flood risk reduction in the region.
Owned by a public utility, Crocker Diversion is regulated and inspected by the California Department of Water Resources (DWR) for safety compliance. With a low hazard potential and satisfactory condition assessment, the dam ensures the safety of the surrounding communities. The last inspection was conducted in May 2020, with a frequency of once per year, indicating a proactive approach to maintenance and monitoring.
Despite its age, Crocker Diversion continues to serve its purpose effectively, protecting the area from potential flooding events. With its strategic location and design, the dam remains a vital component of the water resource management and climate resilience efforts in the region, contributing to the overall sustainability of the Merced River watershed.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Crocker Diversion -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Turlock Cn Nr La Grange Ca | 912 cfs | → |
| Tuolumne R Bl Lagrange Dam Nr Lagrange Ca | 186 cfs | → |
| Modesto Cn Nr La Grange Ca | 834 cfs | → |
| Big C Ab Whites Gulch Nr Groveland Ca | 1 cfs | → |
| Salt Slough A Hwy 165 Nr Stevinson Ca | 32 cfs | → |
| Tuolumne R Bl Early Intake Nr Mather Ca | 1,990 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Crocker Diversion.
Boat launches
- Merals Pool Put-In
- Forest Route 1n10 Tuolumne County
- County Road 29 Madera County
- Road 29 Madera County
Campgrounds
- Lake Mcswain Rec Area
- Mcclure Point Rec Area
- Barrett Cove Rec Area
- Fleming Meadow - Don Pedro Rec Area
- Blue Oaks - Don Pedro Rec Area
- Turlock Lake State Rec Area
Fishing spots
Paddle runs
- Clavey River From Cottonwood Road To Confluence With Tuolumne
- Confluence With Middle Fork Tuolumne River To Confluence With Tuolumne River
- Clavey River From 3n01 To Cottonwood Road
- Confluence With North Fork And Middle Fork Stanislaus To Clark Flat
- Clavey River At Confluence Of Bell And Lily Creeks To 3n01
- Sandbar To Confluence With North Fork Stanislaus River
More reservoirs
Track Crocker Diversion in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Crocker Diversion
Where does the data for Crocker Diversion come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Crocker Diversion.