Greden Detention dam
Greden Detention
Greden Detention, located in MINNEISKA, Minnesota, along the TR-TROUT CREEK, is a private earth dam designed by USDA NRCS and completed in 1963 for the primary purpose of Flood Risk Reduction. This 25-foot high dam with a length of 258 feet has a normal storage capacity of 11 acre-feet and a maximum discharge of 45 cubic feet per second. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3 due to its location and design.
Managed by the Natural Resources Conservation Service, Greden Detention serves as a crucial infrastructure for mitigating flood risks in Winona County. Although not regulated or inspected by the state, the dam's structural integrity and overall condition remain unrated. With an uncontrolled spillway and outlet gates, the dam's emergency action plan and risk management measures are currently not assessed or updated, leaving room for improvement in ensuring the safety and efficiency of this vital water resource.
Overall, Greden Detention represents a significant asset for flood control efforts in the area, providing essential protection to the surrounding community. As climate change continues to impact water resources and exacerbate flooding events, the proper maintenance and evaluation of structures like Greden Detention will be crucial in safeguarding lives and property from potential disasters. Collaborative efforts between federal agencies, local authorities, and private owners are essential to ensure the resilience and effectiveness of such critical infrastructure in the face of evolving climate challenges.
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 Greden Detention -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Zumbro River At Kellogg | 1,550 cfs | → |
| Mississippi River At Winona | 29,800 cfs | → |
| Trempealeau River At Dodge | 765 cfs | → |
| Trempealeau River At Arcadia | 697 cfs | → |
| Root River Near Pilot Mound | 449 cfs | → |
| South Fork Zumbro River At Rochester | 179 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Greden Detention.
Boat launches
- Mississippi River -- Upper Spring Lake Landing
- Mississippi River -- Lower Spring Lake Landing
- Mississippi River -- Merrick Park South
- Mississippi River -- Belvidere Slough Landing
- Mississippi River -- Fountain City Boat Dock
- Mississippi River -- Lower Fountain City Landing
Campgrounds
- John Latsch State Park
- Richard J. Dorer Sf -Snake Creek
- Merrick State Park Campground
- Merrick State Park
- Carley State Park
- Group Site 1 (Grp1)
Fishing spots
- Dacota Street Fishing Pier
- Huff Street Fishing Pier
- Franklin St. Fishing Pier
- Bigalks Creek
- Coldwater Creek
- Pine Creek
Track Greden Detention 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 Greden Detention
Where does the data for Greden Detention 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 Greden Detention.