Lone Tree dam
Lone Tree
Lone Tree, located in Larimer County, Colorado, is a privately owned water reservoir known also as Home Supply Reservoir. With a history dating back to 1882, this Earth dam structure stands at a height of 29 feet, holding a storage capacity of 10,973 acre-feet to support irrigation in the region. The reservoir serves multiple purposes including fish and wildlife habitat, recreation, and irrigation, making it a vital resource for the local community.
Managed by the Colorado Division of Water Resources, Lone Tree is regulated and inspected regularly to ensure its structural integrity and compliance with state standards. With a spillway width of 900 feet and a significant hazard potential, the reservoir has a moderate risk rating and a satisfactory condition assessment as of the last inspection in July 2019. Despite its age, Lone Tree continues to play a crucial role in water resource management, providing essential support for agriculture and conservation efforts in the area.
Located along the Big Thompson River, Lone Tree not only serves as a water source but also contributes to the natural ecosystem and recreational opportunities in the region. With its historical significance and ongoing maintenance efforts, this reservoir remains a key asset for water supply and climate resilience in Larimer County, showcasing the importance of sustainable water management practices for the future.
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 Lone Tree -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Big Thompson River At Loveland | 73 cfs | → |
| Buckhorn Creek Near Masonville | 20 cfs | → |
| St. Vrain Creek At Lyons | 114 cfs | → |
| St. Vrain Creek At Mouth | 103 cfs | → |
| St Vrain Cr Blw Boulder Cr At Hwy 119 Nr Longmont | 71 cfs | → |
| St. Vrain Creek Below Longmont | -999,999 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lone Tree.
Boat launches
- Boat Ramp Larimer County
- Lagerman Trail Boulder County
- Filter Plant River Access Point (Put-In)
- Bridges River Access Point (Put-In)
- Bridges River Access Point (Take-Out)
- Bridges River Access Point (Take-Out #2)
Campgrounds
- Carter Lake - South Side Campgrounds
- Carter Lake - North Side Campgrounds
- North Pine Campground
- Flatiron Reservoir
- Boyd Lake State Park
- Pinewood Reservoir
Fishing spots
- Lonetree Reservoir
- Lon Hagler Reservoir
- Roberts Lake
- Boedecker Reservoir
- River`S Edge And Jayhawker Ponds
- Loveland Service Center Pond
Paddle runs
More reservoirs
Track Lone Tree 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 Lone Tree
Where does the data for Lone Tree 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 Lone Tree.