Hj Mills Reclamation dam
Hj Mills Reclamation
Located in Riverside, California, Hj Mills Reclamation is a vital piece of infrastructure designed for water supply purposes. Completed in 1996, this earth dam stands at a height of 48 feet and boasts a storage capacity of 98 acre-feet. With a surface area of 16 acres and a drainage area of 0.03 square miles, this offstream structure plays a crucial role in water management in the region.
Maintained by the California Department of Water Resources and regulated by the Safety of Dams agency, Hj Mills Reclamation has a significant hazard potential but is currently assessed to be in satisfactory condition. The dam underwent its last inspection in October 2020, with a frequency of one inspection per year. In case of emergencies, there is an Emergency Action Plan (EAP) in place, last revised in December 2018, to ensure swift and coordinated responses to any potential risks or incidents.
With its strategic location and modern design, Hj Mills Reclamation serves as a key component of the water infrastructure in Riverside. As climate change continues to impact water resources, structures like this play an essential role in ensuring a reliable water supply for the community. As enthusiasts of water resources and climate, the details of Hj Mills Reclamation offer a fascinating insight into the intersection of engineering, regulation, and environmental stewardship in managing our precious water sources.
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 Hj Mills Reclamation -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Santa Ana R A E St Nr San Bernardino Ca | 2 cfs | → |
| San Timoteo C Nr Loma Linda Ca | 3 cfs | → |
| Perris Valley Storm Dr A Nuevo Rd Nr Perris Ca | · | → |
| Warm C Nr San Bernardino Ca | · | → |
| Lytle C A Colton Ca | · | → |
| San Jacinto R Nr Sun City Ca | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hj Mills Reclamation.
Boat launches
- Vacation Drive 28736, Canyon Lake
- Goetz Road Riverside County
- Pacific Crest Trail, Hesperia
- Warren Road 37701, Temecula
- Eucalyptus Park Road, San Dimas
Campgrounds
- March Arb Military
- Rancho Jurupa Park
- Lake Perris State Rec Area
- Cherry Valley Lakes
- Lake Elsinore
- Yucaipa Regional Park
Fishing spots
Paddle runs
- San Mateo Wilderness Boundary To Nf Boundary With Camp Pendleton
- Below Deep Creek Lake To Below 2w01 Crossing
- Filaree Flat To Confluence With Bear Creek
- Big Bear Dam To Private Land In Sec 19, T1n, R1w
- Big Meadows To Filaree Flat
- Middle Fork - Commanche Campsite To Middle Fork Trailhead
Track Hj Mills Reclamation 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 Hj Mills Reclamation
Where does the data for Hj Mills Reclamation 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 Significant 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 Hj Mills Reclamation.