Glen Martin dam
Glen Martin
Glen Martin, also known as Shadow Lake, is a private water supply dam located in Yucaipa, California. Built in 1950, this earth-type dam stands at a height of 55 feet and has a hydraulic height of 49 feet, with a storage capacity of 33 acre-feet. The dam serves the primary purpose of water supply, while also providing opportunities for recreation in the area.
Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Glen Martin Dam is regulated, permitted, inspected, and enforced by the state authorities to ensure its safety and compliance with regulations. With a fair condition assessment and a high hazard potential, the dam undergoes regular inspections to monitor its structural integrity and mitigate any risks associated with its operation.
Situated on Mountain Home Creek in San Bernardino County, Glen Martin Dam plays a crucial role in water resource management in the region. With its significant storage capacity and strategic location, the dam not only supports water supply needs but also contributes to the overall ecosystem health and recreational activities in the area. Enthusiasts in water resources and climate can appreciate the importance of Glen Martin Dam in sustaining water availability and ecological balance in the region.
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 Glen Martin -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sar Supp Gage Nr Mentone Ca | 30 cfs | → |
| Santa Ana R Nr Mentone (River Only) Ca | 23 cfs | → |
| Plunge C Nr East Highlands Ca | 2 cfs | → |
| City C Nr Highland Ca | 3 cfs | → |
| Sand Canyon C Nr Highland Ca | 1 cfs | → |
| E Twin C Nr Arrowhead Springs Ca | 1 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Glen Martin.
Campgrounds
- Mountain Home Flat
- Columbine Springs
- Limber Pine Bench
- Seven Oaks Mountain Resort
- Siberia Creek Trail Camp
- Yellow Post #28
Fishing spots
Paddle runs
- Big Meadows To Filaree Flat
- Filaree Flat To Confluence With Bear Creek
- Big Bear Dam To Private Land In Sec 19, T1n, R1w
- Bluff Lake To Confluence With Bear Creek
- South Fork Meadows To San Gorgonia Wilderness Boundary
- Below Deep Creek Lake To Below 2w01 Crossing
More reservoirs
Track Glen Martin 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 Glen Martin
Where does the data for Glen Martin 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 High 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 Glen Martin.