Assman #4 Grade Stabilization Structure dam
Assman #4 Grade Stabilization Structure
The Assman #4 Grade Stabilization Structure in the Boyer River floodplain of Crawford, Iowa, stands as a testament to the efforts of the USDA NRCS in mitigating erosion and improving water quality. Completed in 2010, this private-owned earth dam serves multiple purposes, including fire protection and providing a habitat for stock or small fish. With a height of 39 feet and a length of 370 feet, the structure has a storage capacity of 103 acre-feet and covers a surface area of 5.6 acres.
Situated in an area regulated by the Iowa DNR, this grade stabilization structure plays a crucial role in managing water flow along the TR-Boyer River. Its low hazard potential and not rated condition assessment reflect the efficiency of its design and maintenance. The dam's presence has not only enhanced the conservation efforts in the region but also contributes to the overall sustainability of the watershed. Enthusiasts of water resource management and climate resilience can find inspiration in the Assman #4 Grade Stabilization Structure as a model for effective land and water resource stewardship.
As a vital component in the Rock Island District, this structure symbolizes the collaborative efforts between private landowners, government agencies, and conservation organizations in ensuring the long-term health of the Boyer River ecosystem. By incorporating best practices in dam construction and management, the Assman #4 Grade Stabilization Structure serves as a beacon of innovation in sustainable water resource management. Its strategic location and design highlight the importance of proactive measures in adapting to the challenges posed by climate change and ensuring the resilience of water infrastructure in the face of evolving environmental conditions.
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 Assman #4 Grade Stabilization Structure -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Maple River At Mapleton | 404 cfs | → |
| North Raccoon River Near Sac City | 426 cfs | → |
| Little Sioux River Near Turin | 3,050 cfs | → |
| Monona-Harrison Ditch Near Turin | 449 cfs | → |
| Soldier River At Pisgah | 165 cfs | → |
| Boyer River At Logan | 520 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Assman #4 Grade Stabilization Structure.
Boat launches
Track Assman #4 Grade Stabilization Structure 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 Assman #4 Grade Stabilization Structure
Where does the data for Assman #4 Grade Stabilization Structure 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 Assman #4 Grade Stabilization Structure.