Holliday -Flagstaff Lake- dam
Holliday -Flagstaff Lake-
Holliday -Flagstaff Lake- is a private irrigation dam located in Two Dot, Montana, on Flagstaff Creek. Built in 1939 by the USDA NRCS, this earth dam stands at 38 feet high and spans 800 feet in length. With a storage capacity of 250 acre-feet, the dam serves the primary purpose of irrigation for the surrounding area, providing water for agricultural activities. The structure is state-regulated by the Montana Department of Natural Resources and Conservation, ensuring proper inspection, enforcement, and permitting processes are in place to maintain its functionality.
Situated in Meagher County, Montana, Holliday -Flagstaff Lake- plays a crucial role in water resource management in the region, with a low hazard potential and a condition assessment of "Not Rated." The dam is designed to withstand hydraulic pressures and ensure the safety of downstream areas in case of emergencies. While the structure has not been modified in recent years, it continues to be a reliable resource for water supply and irrigation needs. The dam is not under the jurisdiction of the US Army Corps of Engineers, indicating that its operations and maintenance are overseen by private owners and state agencies.
As a key component of the irrigation infrastructure in the area, Holliday -Flagstaff Lake- contributes to the sustainable use of water resources and supports agricultural development in Meagher County. With a history dating back to the late 1930s, the dam stands as a testament to the importance of water management in arid regions like Montana. As climate change impacts water availability, structures like Holliday -Flagstaff Lake- become even more vital for securing water supplies and mitigating the effects of drought on agriculture and local communities.
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 Holliday -Flagstaff Lake- -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Musselshell R Ab Martinsdale Mt | 43 cfs | → |
| Musselshell River Nr Martinsdale | 81 cfs | → |
| Musselshell River At Harlowton Mt | 101 cfs | → |
| Smith River Near Ft Logan Mt | 143 cfs | → |
| Smith River Bl Eagle Cr Nr Fort Logan Mt | 256 cfs | → |
| Belt Creek Near Monarch Mt | 200 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Holliday -Flagstaff Lake-.
Campgrounds
- Whitetail Camp Campground
- Whitetail Camp
- Hunters Spring Cabin
- Richardson Campground
- Daisy Dean Camp
- Daisy Dean Camp Campground
Fishing spots
- Flagstaff Reservoir
- Bair Reservoir
- North Fork Musselshell River
- North Fork Smith River
- Indian Creek
- Lost Fork
Track Holliday -Flagstaff Lake- 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 Holliday -Flagstaff Lake-
Where does the data for Holliday -Flagstaff Lake- 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 Low 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 Holliday -Flagstaff Lake-.