Croy Subwatershed Site A4-4572 dam
Croy Subwatershed Site A4-4572
Located in Monona, Iowa, the Croy Subwatershed Site A4-4572 is a small earth dam completed in 1951 for fire protection, stock, or small fish pond purposes. Managed by the local government, this site is regulated by the Iowa Department of Natural Resources and is designed by the USDA NRCS. With a low hazard potential and a moderate risk assessment rating, this dam has a storage capacity of 62 acre-feet and serves a drainage area of 0.52 square miles in the Maple River watershed.
The Croy Subwatershed Site A4-4572 plays a crucial role in flood risk reduction and water resource management in the region. Although the dam's condition is currently not rated, it is regularly inspected and maintained by state regulatory agencies to ensure its structural integrity and safety. With a spillway type of uncontrolled and a structural height of 20 feet, this dam serves as a vital infrastructure for the community of Little Sioux and surrounding areas.
Enthusiasts of water resources and climate will find the Croy Subwatershed Site A4-4572 a fascinating example of local government-led water management efforts. With its historic significance as a fire protection and stock pond structure, as well as its contribution to flood risk reduction in the Maple River watershed, this site showcases the importance of sustainable water infrastructure in rural Iowa. As the site continues to be monitored and managed by state agencies, it stands as a testament to the collaborative efforts towards resilient water resource management in the region.
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 Croy Subwatershed Site A4-4572 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Sioux River Near Turin | 1,680 cfs | → |
| Monona-Harrison Ditch Near Turin | 187 cfs | → |
| Maple River At Mapleton | 264 cfs | → |
| Soldier River At Pisgah | 125 cfs | → |
| Missouri River At Decatur | 26,300 cfs | → |
| West Fork Ditch At Hornick | 80 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Croy Subwatershed Site A4-4572.
Boat launches
Campgrounds
Track Croy Subwatershed Site A4-4572 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 Croy Subwatershed Site A4-4572
Where does the data for Croy Subwatershed Site A4-4572 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 Croy Subwatershed Site A4-4572.