Fann Detention dam
Fann Detention
Fann Detention, also known as N&H Acres, is a private-owned earth dam located in Fillmore County, Minnesota. Built by the NRCS in 1993, this structure serves the primary purpose of flood risk reduction along the Root River. Standing at a height of 30 feet and a length of 350 feet, Fann Detention has a storage capacity of 24.3 acre-feet and a maximum discharge of 200 cubic feet per second.
Managed by the Minnesota Department of Natural Resources, Fann Detention has a low hazard potential and is considered to be in satisfactory condition as of its last inspection in June 2017. With a moderate risk assessment rating, this dam is equipped with uncontrolled spillways and gates. Despite its age, the structure continues to play a crucial role in mitigating flood risks in the region, ensuring the safety of nearby communities like Rushford.
As a vital component of flood risk management in Fillmore County, Fann Detention stands as a testament to effective infrastructure design and maintenance. With its strategic location and design features, this earth dam remains a key asset in safeguarding the local environment and residents from potential water-related hazards. Climate enthusiasts and water resource professionals alike can appreciate the significance of Fann Detention in preserving the natural landscape and enhancing resilience to changing weather patterns 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 Fann Detention -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Root River Near Houston | 845 cfs | → |
| South Fork Root River Near Houston | 182 cfs | → |
| Root River Near Pilot Mound | 385 cfs | → |
| Mississippi River At Winona | 29,400 cfs | → |
| Upper Iowa River At Bluffton | 288 cfs | → |
| Trempealeau River At Dodge | 649 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Fann Detention.
Boat launches
Campgrounds
- Trailside Campground
- North End City Park
- Peterson Rv Campground
- Vinegar Ridge Campground
- Wet Bark Campground
- Cushon's Peak Campground
Fishing spots
- Huff Street Fishing Pier
- Dacota Street Fishing Pier
- Franklin St. Fishing Pier
- Coldwater Creek
- Bigalks Creek
- Pine Creek
Paddle runs
- The Minnesota-Iowa State Border To Ends Near The Town Of Bluffton, Iowa
- The Town Of Bluffton To The "Lower" Dam, Near The Confluence Of Coon Creek
- The "Lower" Dam, Near The Confluence Of Coon Creek To Lane's Bridge
- Western Boundary Of Effigy Mounds National Monument To Boundary Of Effigy Mounds National Monument
Track Fann 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 Fann Detention
Where does the data for Fann 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 Fann Detention.