Henry J. Mills No. 2 dam
Henry J. Mills No. 2
Henry J. Mills No. 2 is a vital water resource infrastructure located in Riverside, California, completed in 1996 with a primary purpose of water supply. This earth dam stands at a height of 34 feet and has a hydraulic height of 30.3 feet, providing a storage capacity of 92 acre-feet. The dam covers a surface area of 5 acres and serves a drainage area of 0.1 square miles, ensuring a steady water supply for the region.
Managed by a public utility, Henry J. Mills No. 2 is regulated by the California Department of Water Resources (DWR) for safety and compliance. The dam has a high hazard potential but is currently assessed as satisfactory in condition, with the last inspection conducted in October 2020. With state permitting, inspection, and enforcement in place, this crucial water infrastructure plays a crucial role in supplying water to the surrounding communities in Riverside County.
Although the dam does not have a spillway or outlet gates, its design and construction meet regulatory standards for water storage and management. With a dedicated emergency action plan and regular risk assessments, Henry J. Mills No. 2 ensures the safety and security of the local population in case of any unforeseen events. As climate change continues to impact water resources, this dam stands as a crucial asset in securing the water supply for Riverside and highlights the importance of sustainable water management practices in the face of a changing climate.
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 Henry J. Mills No. 2 -- 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 | · | → |
| Lytle C A Colton Ca | · | → |
| Warm C Nr San Bernardino Ca | · | → |
| San Jacinto R Nr Sun City Ca | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Henry J. Mills No. 2.
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
- Lake Elsinore
- Cherry Valley Lakes
- 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 Henry J. Mills No. 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 Henry J. Mills No. 2
Where does the data for Henry J. Mills No. 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 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 Henry J. Mills No. 2.