Declez Retention dam
Declez Retention
Declez Retention in Riverside, California, is a local government-owned structure designed for flood risk reduction along the Tr San Sevaine Creek. Completed in 1984, this earth dam stands at a height of 30 feet with a hydraulic height of 23 feet, providing a storage capacity of 331 acre-feet. The dam has a length of 1500 feet and a surface area of 21 acres, serving as a crucial infrastructure for water resource management in the region.
With a high hazard potential, Declez Retention undergoes regular inspections to ensure its structural integrity. The last assessment in September 2017 deemed its condition as satisfactory, with a hazard potential rating of high. The Emergency Action Plan (EAP) for the dam was last reviewed in October 2019, highlighting the importance of preparedness and risk management measures in case of emergencies. Mark Takano, a Congressman representing the area, is involved in overseeing the safety and regulatory aspects of the dam.
As a vital component in the flood risk reduction strategy for Glen Avon Heights, Declez Retention plays a crucial role in safeguarding the community from potential disasters. Its strategic location and design make it an essential asset for water resource management and climate resilience efforts in the region, underlining the importance of proactive maintenance and adherence to safety protocols to ensure its continued effectiveness in mitigating flood risks.
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 Declez Retention -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cucamonga C Nr Mira Loma Ca | 19 cfs | → |
| Temescal C Ab Main St A Corona Ca | 0 cfs | → |
| Fontana Water Co Spill Ch From Afterbay Nr Fontana | 24 cfs | → |
| Lytle C A Colton Ca | · | → |
| Santa Ana R A E St Nr San Bernardino Ca | 2 cfs | → |
| Warm C Nr San Bernardino Ca | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Declez Retention.
Boat launches
- Eucalyptus Park Road, San Dimas
- Pacific Crest Trail, Hesperia
- Vacation Drive 28736, Canyon Lake
- Goetz Road Riverside County
Campgrounds
- Rancho Jurupa Park
- Prado Regional Park
- Glen Helen Regional Park
- Bonita Ranch Campground
- Kelly Camp
- Commanche
Fishing spots
- Cucamonga-Guasti Regional Park Lake
- Lake Evans
- Prado Regional Park, El Lake
- Glen Helen Lakes
- Secombe Lake
- Mt Baldy Trout Pools
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)
- Below Deep Creek Lake To Below 2w01 Crossing
- Below 2w01 Crossing To Mojave Reservoir
- 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)
Track Declez Retention 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 Declez Retention
Where does the data for Declez Retention 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 Declez Retention.