South Magnolia Watershed Site 3 dam
South Magnolia Watershed Site 3
South Magnolia Watershed Site 3, located in Harrison County, Iowa, is a crucial water resource managed by the local government. Built in 1958 by the USDA SCS, this earth dam serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. With a height of 28 feet and a length of 735 feet, the dam has a storage capacity of 72 acre-feet and covers a surface area of 2.8 acres.
The dam is situated on TR-WILLOW CREEK and is regulated by the Iowa DNR, with state permitting, inspection, and enforcement in place. Despite its low hazard potential and moderate risk assessment rating, the condition of the dam has not been officially assessed. While the last inspection took place in 1965, the dam's emergency action plan status remains unclear, highlighting the need for updated risk management measures and adherence to state guidelines.
South Magnolia Watershed Site 3 plays a vital role in flood risk reduction within the region, providing valuable water resources for both agricultural and environmental purposes. Climate enthusiasts and water resource management professionals are encouraged to monitor and support the ongoing maintenance and regulatory efforts to ensure the long-term sustainability of this important infrastructure.
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 South Magnolia Watershed Site 3 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Boyer River At Logan | 520 cfs | → |
| Soldier River At Pisgah | 163 cfs | → |
| Little Sioux River Near Turin | 1,910 cfs | → |
| Monona-Harrison Ditch Near Turin | 387 cfs | → |
| Big Papillion Cr | 64 cfs | → |
| Missouri River At Decatur | 28,700 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near South Magnolia Watershed Site 3.
Boat launches
- Desoto Bend Nwr
- Blair City Boat Ramp
- Pelican Point
- Summit Lake
- Dodge Park Road , 68112:68152 Omaha
- Main Boat Ramp
Track South Magnolia Watershed Site 3 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 South Magnolia Watershed Site 3
Where does the data for South Magnolia Watershed Site 3 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 South Magnolia Watershed Site 3.