Harrison County Roadgrade Dam 18-79-43 dam
Harrison County Roadgrade Dam 18-79-43
Harrison County Roadgrade Dam 18-79-43, located in Iowa along the TR-WILLOW CREEK, was completed in 1959 with a primary purpose of fire protection, stock, or small fish pond. This earth dam stands at a height of 66 feet and stretches 395 feet in length, providing a storage capacity of 486 acre-feet and covering a surface area of 14.1 acres. Managed by the local government and designed by USDA NRCS, this dam is regulated by the Iowa DNR and undergoes regular inspections to ensure its structural integrity and safety.
With a significant hazard potential and a moderate risk assessment rating, Harrison County Roadgrade Dam 18-79-43 is classified as satisfactory in its condition assessment. The dam has a controlled spillway type with a width of 2 feet and is equipped for emergency situations with an inspection frequency of 5 years. The surrounding area, including the Missouri River, benefits from the water resource management provided by this dam, serving as a vital asset for the community's needs for firefighting, livestock, and recreational purposes.
As a part of the local government's infrastructure, this dam plays a crucial role in water resource management and climate resilience in Harrison County, Iowa. With its soil foundation and uncontrolled spillway, the dam serves as a reliable structure for water storage and flood control, ensuring the safety of the surrounding areas. Through continued monitoring and maintenance, Harrison County Roadgrade Dam 18-79-43 remains a key component in the region's efforts to manage water resources effectively and mitigate potential risks associated with dam failure.
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 Harrison County Roadgrade Dam 18-79-43 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Boyer River At Logan | 575 cfs | → |
| Soldier River At Pisgah | 221 cfs | → |
| Little Sioux River Near Turin | 1,540 cfs | → |
| Monona-Harrison Ditch Near Turin | 461 cfs | → |
| Big Papillion Cr | 82 cfs | → |
| Missouri River At Omaha | 31,200 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Harrison County Roadgrade Dam 18-79-43.
Boat launches
- Desoto Bend Nwr
- Blair City Boat Ramp
- Pelican Point
- Dodge Park Road , 68112:68152 Omaha
- Summit Lake
- Main Boat Ramp
Track Harrison County Roadgrade Dam 18-79-43 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 Harrison County Roadgrade Dam 18-79-43
Where does the data for Harrison County Roadgrade Dam 18-79-43 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 Significant 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 Harrison County Roadgrade Dam 18-79-43.