Middle Lake dam
Middle Lake
Middle Lake, located in Nicollet, Minnesota, is a gravity dam built in 1946 with a primary purpose that goes beyond just water storage. Owned by the local government, this dam on County Ditch 4A stands at 6 feet tall and has a storage capacity of 6,597 acre-feet. The dam, with a drainage area of 14.4 square miles, serves various regulatory functions under the oversight of the Minnesota Department of Natural Resources and is subject to regular inspections to ensure its satisfactory condition.
The dam at Middle Lake plays a crucial role in managing water resources in the area, with a low hazard potential and a maximum discharge capacity of 300 cubic feet per second. Despite its age, the dam has been well-maintained and meets regulatory guidelines, with the last inspection conducted in June 2016. The dam's satisfactory condition and efficient operation underscore its importance in mitigating flood risks and ensuring water supply reliability for the local community. Middle Lake serves as a testament to the collaborative efforts between local government and state agencies in safeguarding water resources and climate resilience in Minnesota.
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 Middle Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Cottonwood River Near Courtland | 103 cfs | → |
| Minnesota River At Mankato | 11,300 cfs | → |
| Cottonwood River Near New Ulm | 495 cfs | → |
| Blue Earth River Near Rapidan | 3,920 cfs | → |
| Le Sueur River Near Rapidan | 3,650 cfs | → |
| Minnesota River At New Ulm | 2,730 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Middle Lake.
Boat launches
- Minnesota River Boat Landing
- East Robinson Street 598, Lake Crystal
- T-750 Blue Earth County
- New Ulm
- Minnecon Drive New Ulm
- Le Sueur County
Campgrounds
- Minneopa State Park
- Land Of Memories City Park
- Riverside Park - St Peter
- Riverside City Park
- Rapidan Dam County Park
- Lake Washington Park
More reservoirs
Track Middle 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 Middle Lake
Where does the data for Middle 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 Middle Lake.