Arnold-Armstrong Subwtrshd Gully 23 dam
Arnold-Armstrong Subwtrshd Gully 23
Arnold-Armstrong Subwtrshd Gully 23 is a significant earth dam located in Monona, Iowa, with a primary purpose of fire protection, stock, or small fish pond. Completed in 1961, this dam has a height of 36 feet and a length of 470 feet, providing a storage capacity of 35 acre-feet. The dam is owned and regulated by the local government, with oversight from the Iowa Department of Natural Resources.
The dam's condition assessment in 2015 rated it as fair, with a significant hazard potential. Despite its moderate risk assessment, the dam has not been modified in recent years and lacks emergency action plans and inundation maps. The surrounding area, which includes the TR-MAPLE RIVER, is at risk of flooding, making it crucial for proper management and maintenance of the dam to ensure the safety of the community.
With its location in a rural area prone to flooding, the Arnold-Armstrong Subwtrshd Gully 23 serves as a crucial infrastructure for flood risk reduction. As water resource and climate enthusiasts, it is important to monitor the condition of this dam and advocate for necessary updates and emergency preparedness measures to protect the surrounding environment and communities from potential disasters.
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 Arnold-Armstrong Subwtrshd Gully 23 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Maple River At Mapleton | 264 cfs | → |
| Little Sioux River Near Turin | 1,590 cfs | → |
| West Fork Ditch At Hornick | 80 cfs | → |
| Monona-Harrison Ditch Near Turin | 193 cfs | → |
| Soldier River At Pisgah | 123 cfs | → |
| Missouri River At Decatur | 26,000 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Arnold-Armstrong Subwtrshd Gully 23.
Boat launches
Campgrounds
Track Arnold-Armstrong Subwtrshd Gully 23 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 Arnold-Armstrong Subwtrshd Gully 23
Where does the data for Arnold-Armstrong Subwtrshd Gully 23 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 Arnold-Armstrong Subwtrshd Gully 23.