Lyon County Roadgrade Dam 10-98-48 dam
Lyon County Roadgrade Dam 10-98-48
Lyon County Roadgrade Dam 10-98-48, located in Iowa along the TR- Big Sioux River, is a local government-owned structure with a low hazard potential and a moderate risk assessment. Constructed in 1988 by Lyon Co. Engineer, this earth dam stands at a height of 31 feet and has a length of 725 feet, providing a storage capacity of 35 acre-feet. The dam serves a primary purpose of "Other" and is designed for state-regulated operations, inspections, and enforcement by the Iowa Department of Natural Resources.
Despite its uncontrolled spillway type, Lyon County Roadgrade Dam 10-98-48 has not been rated for its condition assessment and lacks emergency action plans and updated contact information. With a drainage area of 0.19 square miles and a normal storage capacity of 18 acre-feet, the dam poses a moderate risk level with no recent modifications or known structural issues. As a key infrastructure along the Big Sioux River, the dam plays a crucial role in water resource management and flood control efforts in the region.
As water resource and climate enthusiasts explore the significance of Lyon County Roadgrade Dam 10-98-48, its location in Lyon, Iowa, and its operational oversight by the state regulatory agency highlight the importance of maintaining and monitoring this critical infrastructure. With a focus on risk management and safety measures, the dam's role in protecting the surrounding community and supporting ecological balance underscores the need for continued attention and investment in water infrastructure resilience in the face of changing 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 Lyon County Roadgrade Dam 10-98-48 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Rock River Near Rock Valley | 784 cfs | → |
| Rock River Below Tom Creek At Rock Rapids | 173 cfs | → |
| Big Sioux R At Sioux Falls Sd | 37 cfs | → |
| Big Sioux R At North Cliff Ave At Sioux Falls Sd | 302 cfs | → |
| Split Rock Cr At Corson Sd | 16 cfs | → |
| Skunk Cr At Sioux Falls Sd | 15 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lyon County Roadgrade Dam 10-98-48.
Boat launches
- Copperwood Court Lincoln County
- 310th Street Sioux County
- Wall Lake Boat Ramp
- Split Rock Park Road Garretson
Track Lyon County Roadgrade Dam 10-98-48 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 Lyon County Roadgrade Dam 10-98-48
Where does the data for Lyon County Roadgrade Dam 10-98-48 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 Lyon County Roadgrade Dam 10-98-48.