Alta Loma Basin #1 dam
Alta Loma Basin #1
Alta Loma Basin #1 is a vital flood risk reduction structure located in Alta Loma, California, along the Alta Loma Channel. Completed in 1964, this earth dam stands at a height of 30 feet and has a storage capacity of 70 acre-feet. With a drainage area of 1.98 square miles, it plays a crucial role in mitigating potential flooding in the region, making it a key asset for water resource management in San Bernardino County.
Managed by the local government with state regulation and enforcement, Alta Loma Basin #1 has a high hazard potential but is currently assessed to be in satisfactory condition as of September 2017. Regular inspections are conducted, with the last one taking place in December 2019, ensuring the dam's structural integrity and functionality. The primary purpose of this dam is flood risk reduction, showcasing its importance in safeguarding the surrounding communities from potential water-related disasters.
With its strategic location and effective design, Alta Loma Basin #1 stands as a critical infrastructure for flood control in the region. Its history of service and maintenance, along with its significant storage capacity, highlights its importance in preserving water resources and ensuring climate resilience in the face of potential natural disasters. For water resource and climate enthusiasts, this dam serves as a prime example of sustainable infrastructure that plays a crucial role in protecting communities and enhancing water security.
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 Alta Loma Basin #1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Lytle C Nr Fontana Ca | 43 cfs | → |
| Fontana Uwc Surface Div Nr Fontana Ca | 26 cfs | → |
| Fontana Ph Forebay Spillway Nr Fontana Ca | 4 cfs | → |
| Fontana Uwc Surface Div Weir 2 Nr Fontana Ca | 23 cfs | → |
| Cajon C Bl Lone Pine C Nr Keenbrook Ca | 12 cfs | → |
| Cucamonga C Nr Mira Loma Ca | 15 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Alta Loma Basin #1.
Boat launches
Campgrounds
Fishing spots
- Cucamonga-Guasti Regional Park Lake
- Mt Baldy Trout Pools
- Glen Helen Lakes
- Puddingstone Lake
- Puddingstone Reservoir
- Prado Regional Park, El Lake
Paddle runs
- Middle Fork - Commanche Campsite To Middle Fork Trailhead
- Laurel Gulch To Confluence With Mineo Canyon (Se 1/4, Sw 1/4, Sec 17, T2n, R8w)
- East Fork - Confluence Of Vincent Gulch And Prairie Fork (Nw 1/4, Sw 1/4 Sec 16 ) To Laurel Gulch (Nw 1/4, Sw 1/4, Sec 17, T2n, R8w)
- North Fork - Confluence Of Soldier And Coldbrook Creeks (Se1/4,Sw1/4, Sec) 5, T2n,,R9w To Conflluence With West Fork Of San Gabriel (Sw 1/4,Sw1/4, Sec 17, T2n, R8w)
- Mainstream - Headwaters To Confluence With Cooper Canyon
- Gaging Station Below Spillway Of Cogswell Dam (Ne 1/4, Se 1/4, Sec 19, T2n, R10w) To Confluence With Nf San Gabriel River (Sw 1/4.Sw 1/4, Sec 15, T2n, R9w)
Track Alta Loma Basin #1 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 Alta Loma Basin #1
Where does the data for Alta Loma Basin #1 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 Alta Loma Basin #1.