Hall Mill Dam dam
Hall Mill Dam
Hall Mill Dam, also known as Lake Fulmor Dam, is a federal-owned structure located in Riverside, California. Completed in 1949, this earth dam stands at a height of 40 feet and stretches 220 feet in length. It serves a primary purpose other than water storage and is classified as having a high hazard potential. Despite its age, the condition of the dam is currently not rated, and it undergoes inspections annually to ensure its safety.
Managed by the Forest Service, Hall Mill Dam does not fall under state regulation or jurisdiction. It features an uncontrolled spillway and is constructed with a stone core and built on rock and soil foundations. The dam's risk assessment indicates a moderate level of risk, with no emergency action plan in place as of the last data update in May 2021. With its captivating history and design, Hall Mill Dam stands as a notable landmark for water resource and climate enthusiasts interested in exploring the intersection of infrastructure and environmental conservation in California's diverse landscape.
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 Hall Mill Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| San Jacinto R Nr San Jacinto | 0 cfs | → |
| Snow C Nr White Water Ca | · | → |
| Falls C Nr Whitewater Ca | 1 cfs | → |
| Chino Cyn C Bl Tramway Nr Palm Springs Ca | · | → |
| Whitewater R A Windy Point Main Channel Ca | 609 cfs | → |
| Whitewater R A Windy Point Overflow Channel Ca | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hall Mill Dam.
Boat launches
- Anglers Landing, Mountain Center
- Warren Road 37701, Temecula
- Vail Lake Boat Ramp
- Goetz Road Riverside County
- Vacation Drive 28736, Canyon Lake
Campgrounds
- Boulder Basin
- Boulder Basin Campground
- Stone Creek - San Jacinto Mountain State Park
- Fern Basin Campground
- Fern Basin
- Dark Canyon
Fishing spots
Track Hall Mill Dam 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 Hall Mill Dam
Where does the data for Hall Mill Dam 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 Hall Mill Dam.