Glen Ullin Rr Dam 1 dam
Glen Ullin Rr Dam 1
Glen Ullin Rr Dam 1, also known as South Reservoir, is a state-owned structure located in Morton County, North Dakota. Built in 1909 by NDSWC & NPRR, this buttress type dam stands at a height of 15.8 feet and has a storage capacity of 143.6 acre-feet. Situated on Big Muddy Creek, the dam serves primarily for recreational purposes and has a normal storage level of 77.3 acre-feet, covering a surface area of 19.7 acres.
With a significant hazard potential and a moderate risk assessment rating, Glen Ullin Rr Dam 1 is regulated by the North Dakota State Water Commission (NDSWC) and undergoes regular inspections, permitting, and enforcement processes. The dam features an uncontrolled spillway with a width of 170 feet and is equipped with a single slide (sluice gate) outlet. While the dam's condition assessment is currently not rated, it remains an important structure for water resource management and climate enthusiasts in the region.
For those interested in water resource management and climate resilience, Glen Ullin Rr Dam 1 offers insights into dam engineering, regulatory oversight, and risk assessment. As a historic structure with a long-standing presence in the community, the dam continues to provide recreational opportunities while also serving as a critical infrastructure for water storage and flood control. With its location in the St. Paul District and alignment with state jurisdiction and permitting requirements, the dam showcases the collaborative efforts between state agencies and the local community to ensure the safety and sustainability of water resources in North Dakota.
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 Glen Ullin Rr Dam 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Heart R Ab Lake Tschida Nr Glen Ullin | 24 cfs | → |
| Big Muddy Creek Near Almont | 6 cfs | → |
| Antelope Creek Nr Carson | 1 cfs | → |
| Heart River Nr Richardton | 22 cfs | → |
| Knife River Nr Golden Valley | 13 cfs | → |
| Sweetbriar Creek Nr Judson | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Glen Ullin Rr Dam 1.
Campgrounds
Paddle runs
Track Glen Ullin Rr Dam 1 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 Glen Ullin Rr Dam 1
Where does the data for Glen Ullin Rr Dam 1 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 Glen Ullin Rr Dam 1.