Selvage #2 dam
Selvage #2
Selvage #2 is a private water supply dam located in Gilroy, California, along the Tr Llagas Cr river. It was completed in 1948 and stands at a height of 42 feet, with a hydraulic height of 36 feet and a length of 440 feet. The dam has a storage capacity of 24 acre-feet and serves primarily for irrigation and water supply purposes in the area.
Despite its low hazard potential, Selvage #2 is currently rated as being in poor condition, with its last inspection conducted in March 2021. The dam is regulated by the California Department of Water Resources (DWR) under the Safety of Dams program, ensuring that it meets state permitting, inspection, and enforcement requirements. While the dam's emergency action plan (EAP) status is unknown, measures for risk assessment and management are yet to be determined.
The structure's association with the Natural Resources Conservation Service and its location in Santa Clara County make Selvage #2 an important site for water resource and climate enthusiasts to monitor. With its historical significance dating back over 70 years, the dam's current condition and regulatory oversight offer valuable insights into the management of water resources in California.
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 Selvage #2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Coyote C Bl Coyote Res Nr San Martin Ca | 7 cfs | → |
| Llagas C Nr Gilroy | 12 cfs | → |
| Coyote C Nr Gilroy Ca | 2 cfs | → |
| Pajaro R A Chittenden Ca | 48 cfs | → |
| Corralitos C A Freedom Ca | 2 cfs | → |
| Pacheco C Nr Dunneville Ca | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Selvage #2.
Boat launches
- Uvas Road 15000-15208, Morgan Hill
- Coyote Lake Road 10700-12746, Gilroy
- Oak Glen Avenue 17655, Morgan Hill
- Pinto Lake City Park
- Mckean Road 22707-22725, San Jose
- Rountree Lane Santa Cruz County
Campgrounds
- Manzanita Group Camp
- Mount Madonna
- West Deer Pen Youth Camp
- Huckleberry Group Camp
- Coyote Lake County Park
- Arrowhead Group Camp
Fishing spots
Paddle runs
- Gold Creek To Three Pools (Opal Creek Run)
- Headwaters North Fork Little Sur To Boy Scout Camp
- Boy Scout Camp To Confluence With Mainstem Little Sur
- Headwaters South Fork Little Sur To Confluence With Mainstem Little Sur
More reservoirs
Track Selvage #2 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 Selvage #2
Where does the data for Selvage #2 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 Selvage #2.