Smokey Hollow Subwatershed Site 1 dam
Smokey Hollow Subwatershed Site 1
Smokey Hollow Subwatershed Site 1, located in Woodbury County, Iowa, is a vital flood risk reduction structure designed by H,W,S, Inc. and Hoskins Western Sonderegger Inc. The earthen dam, completed in 1986, stands at a height of 59 feet and spans 517 feet in length, with a maximum storage capacity of 475 acre-feet. Situated along the TR-Smokey Hollow River, this site plays a crucial role in managing water flow and protecting the surrounding areas from potential flooding.
Managed by the Iowa Department of Natural Resources, Smokey Hollow Subwatershed Site 1 is subject to regular inspections, with the last assessment conducted in June 2020, yielding a satisfactory condition rating. Despite its high hazard potential, the dam is deemed to have a moderate risk level, indicating the importance of continued monitoring and risk management measures. With a drainage area of 1.51 square miles and a surface area of 7.9 acres, this structure serves as a key component in safeguarding the local community of Smithland and its residents from the impacts of extreme weather events.
As a significant infrastructure for flood risk reduction in the region, Smokey Hollow Subwatershed Site 1 underscores the collaboration between local government authorities and the Natural Resources Conservation Service in safeguarding water resources and mitigating climate-related threats. With its strategic location and critical role in managing water flow, this site exemplifies the importance of effective dam infrastructure in ensuring the resilience of communities against environmental 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 Smokey Hollow Subwatershed Site 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| West Fork Ditch At Hornick | 80 cfs | → |
| Maple River At Mapleton | 264 cfs | → |
| Little Sioux River At Correctionville | 1,400 cfs | → |
| Little Sioux River Near Turin | 1,680 cfs | → |
| Monona-Harrison Ditch Near Turin | 187 cfs | → |
| Missouri River At Decatur | 26,300 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Smokey Hollow Subwatershed Site 1.
Boat launches
Campgrounds
Track Smokey Hollow Subwatershed Site 1 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 Smokey Hollow Subwatershed Site 1
Where does the data for Smokey Hollow Subwatershed Site 1 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 High 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 Smokey Hollow Subwatershed Site 1.