Upper Glasston North Dam dam
Upper Glasston North Dam
Upper Glasston North Dam, also known as Lake Adam North Dam, is a privately owned structure located in Sweet Grass, Montana. Built in 1912, this earth dam stands at a height of 20 feet and serves primarily for irrigation purposes along the Sweetgrass Canal. With a storage capacity of 1805 acre-feet, the dam presents a high hazard potential and is currently assessed as being in poor condition.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), the Upper Glasston North Dam has a state-regulated status with regular inspections conducted to ensure safety and compliance. Despite its age, the dam continues to play a crucial role in water resource management in the region, although its deteriorating condition raises concerns for potential risks and the need for proactive maintenance and management strategies. For water resource and climate enthusiasts, this dam serves as a significant landmark in the local landscape and highlights the ongoing challenges of balancing water utilization for irrigation with the imperative of infrastructure safety and resilience in the face of changing climate patterns.
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 Upper Glasston North Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Boulder River At Big Timber Mt | 859 cfs | → |
| Musselshell River Ab Mud Cr Nr Shawmut Mt | 168 cfs | → |
| Musselshell River At Harlowton Mt | 214 cfs | → |
| Musselshell River Nr Martinsdale | 169 cfs | → |
| Shields River Nr Livingston Mt | 293 cfs | → |
| South Fork Musselshell R Ab Martinsdale Mt | 43 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Upper Glasston North Dam.
Boat launches
- Howie Road Sweet Grass County
- Greycliff Bridge Sweet Grass County
- North Yellowstone Trail Road Sweet Grass County
- West Frontage Road Stillwater County
Campgrounds
Fishing spots
Paddle runs
Track Upper Glasston North 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 Upper Glasston North Dam
Where does the data for Upper Glasston North 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 Upper Glasston North Dam.