Miller Dam dam
Miller Dam
Miller Dam, located in Coralville Reservoir, Iowa, was completed in 1971 by the USDA NRCS and serves as a private water resource for fire protection, stock, and small fish pond purposes. The earth dam stands at 29 feet tall and stretches 442 feet long, with a storage capacity of 99 acre-feet and a surface area of 6.5 acres. Despite its low hazard potential, the dam is regulated by the Iowa DNR and undergoes regular inspections to ensure its structural integrity and safety.
With its location on TR-Knapp Creek and proximity to the city of Coralville, Miller Dam plays a crucial role in managing water resources in Johnson County. While the dam has not been modified in recent years and is currently rated as "Not Rated" in terms of condition assessment, there is a moderate risk level associated with the structure. This suggests the need for continued monitoring and possibly the implementation of risk management measures to ensure the dam's long-term viability and ability to withstand potential climate impacts.
Overall, Miller Dam serves as a vital water management infrastructure in the region, providing essential services for both agricultural and environmental purposes. As a privately owned dam, it falls under state jurisdiction and is subject to regulations set by the Iowa DNR. Its low hazard potential and moderate risk level highlight the importance of ongoing maintenance and monitoring to safeguard against any potential threats to the surrounding community and water resources.
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 Miller Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Clear Creek Near Oxford | 29 cfs | → |
| Cedar River At Cedar Rapids | 4,580 cfs | → |
| Iowa River At Marengo | 2,450 cfs | → |
| Clear Creek Near Coralville | 33 cfs | → |
| Iowa River Below Coralville Dam Nr Coralville | 2,260 cfs | → |
| Iowa River At Iowa City | 2,280 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Miller Dam.
Boat launches
- Poplar Avenue Northeast Big Grove Township
- J Avenue Northeast 201, Cedar Rapids
- Falcon Lane Big Grove Township
- Mehaffey Bridge Road Northeast , 52333 Iowa
- Anglers Point Road Northeast Big Grove Township
Track Miller Dam 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 Miller Dam
Where does the data for Miller Dam 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 Miller Dam.