Oian Dahl Detention dam
Oian Dahl Detention
Oian Dahl Detention is a privately owned Earth dam in Fillmore, Minnesota, completed in 1992 by the USDA NRCS for the primary purpose of Flood Risk Reduction on the Root River S Branch. With a height of 26 feet and a length of 280 feet, this dam has a storage capacity of 37 acre-feet and a surface area of 2 acres. The dam is regulated by the MNDNR EWR and meets state permitting, inspection, and enforcement requirements.
Despite its low hazard potential and satisfactory condition assessment, Oian Dahl Detention poses a moderate risk level due to its uncontrolled spillway type and outlet gates. The dam has not been modified in recent years and is subject to inspections every 8 years. Emergency action plans and inundation maps have not been prepared, raising concerns about the readiness for potential risks and disasters. The presence of moderate risk underscores the importance of proactive risk management measures for this critical infrastructure in the event of a flooding emergency.
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 Oian Dahl Detention -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Root River Near Houston | 182 cfs | → |
| Root River Near Houston | 1,010 cfs | → |
| Root River Near Pilot Mound | 436 cfs | → |
| Upper Iowa River At Bluffton | 292 cfs | → |
| Upper Iowa River Near Dorchester | 725 cfs | → |
| Mississippi River At Winona | 29,300 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Oian Dahl Detention.
Boat launches
Campgrounds
- Peterson Rv Campground
- Trailside Campground
- North End City Park
- Wet Bark Campground
- Vinegar Ridge Campground
- Eagle Cliff Campground & Lodging
Fishing spots
- Coldwater Creek
- Bigalks Creek
- Pine Creek
- Huff Street Fishing Pier
- Dacota Street Fishing Pier
- Franklin St. Fishing Pier
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 Oian Dahl 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 Oian Dahl Detention
Where does the data for Oian Dahl 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 Oian Dahl Detention.