Herrin Reservoir 1 Dam dam
Herrin Reservoir 1 Dam
Herrin Reservoir 1 Dam, located in Williamson County, Illinois, is a local government-owned structure primarily used for recreation purposes. The dam, completed in 1915, stands at a height of 6 feet and has a length of 489 feet, with a maximum storage capacity of 271 acre-feet. Situated on the TRIB HURRICANE stream, the dam has an uncontrolled spillway with a width of 19 feet and is regulated by the Illinois Department of Natural Resources.
Despite its age, Herrin Reservoir 1 Dam is classified as having a significant hazard potential, with a moderate risk assessment rating of 3. The dam has a history of regular inspections, with the most recent one conducted in June 2017. While the condition assessment is not currently available, the dam's emergency action plan status and risk management measures are not specified in the data provided. Overall, Herrin Reservoir 1 Dam serves as a crucial recreational resource in the area, demonstrating the importance of proper maintenance and monitoring for water resource and climate enthusiasts.
This Earth-type dam, featuring a buttress core design, plays a vital role in providing recreational opportunities for the community. However, its significant hazard potential underscores the importance of ongoing maintenance and risk management to ensure the safety of nearby residents and visitors. With a moderate risk assessment rating, Herrin Reservoir 1 Dam serves as a reminder of the importance of sustainable water resource management practices in the face of changing climate conditions.
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 Herrin Reservoir 1 Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Crab Orchard Creek Near Marion | 4 cfs | → |
| Big Muddy River At Plumfield | 461 cfs | → |
| Big Muddy River At Rte 127 At Murphysboro | 5,680 cfs | → |
| South Fork Saline River Nr Carrier Mills | 526 cfs | → |
| Cache River At Forman | 3,100 cfs | → |
| Lusk Creek Near Eddyville | 10 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Herrin Reservoir 1 Dam.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Herrin Reservoir 1 Dam
Where does the data for Herrin Reservoir 1 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 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 below 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.
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.