L & N Reservoir dam
L & N Reservoir
L & N Reservoir, located in Mount Vernon, Illinois, is a crucial water supply resource owned by the local government and regulated by the Illinois Department of Natural Resources. Built in 1910, this Earth dam stands at a height of 25 feet and spans 720 feet in length, with a storage capacity of 353 acre-feet. The reservoir primarily serves the purpose of water supply, drawing water from the TRIB Casey Fork river.
Despite its age, L & N Reservoir remains a vital infrastructure with a high hazard potential, prompting regular inspections and maintenance. The spillway, with a width of 113 feet, is uncontrolled, and the outlet gates operate in a similar manner. The reservoir holds a moderate risk rating of 3, highlighting the need for ongoing risk management measures to ensure the safety and security of the surrounding community.
In the event of an emergency, contact information and guidelines for Emergency Action Plans (EAP) are not readily available, indicating a potential area for improvement. With its historical significance and continued importance as a water supply source, L & N Reservoir serves as a valuable asset for the region, requiring careful monitoring and management to mitigate risks and safeguard its operation for the future.
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 L & N Reservoir -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Casey Fork At Mount Vernon | 6 cfs | → |
| Rayse Creek Near Waltonville | 4 cfs | → |
| Skillet Fork At Wayne City | 27 cfs | → |
| East Fork Kaskaskia River Near Sandoval | 10 cfs | → |
| Little Crooked Creek Near New Minden | 6 cfs | → |
| Big Muddy River At Plumfield | 232 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near L & N Reservoir.
Boat launches
Campgrounds
- Sam Dale Lake Conservation Area
- Washington County Lake State Conservation Area
- Stephen A. Forbes State Park
- Coles Creek - Lake Carlyle
Paddle runs
- 1/2 Mile Downstream Of Confluence With Kinkaid Creek To Confluence With Mississippi River, Approx 4 Miles South Of Grand Tower, Il
- Wallace Cemetery Approx 2.5 Miles Nw Of Herod, Il To Confluence With Ohio River At Golconda Jobs Corp Center
- Source, About 2 Miles East Of Delwood, Il (Sec 10, T11s, R6e) To Bridge At Eddyville Blacktop (Se1/4,Sec.16,T12s, R6e)
- 1 Minle Southwest Of Delwood, Il (Sec. 18, T11s, R13e) To Reesville, 1/4 Mile South Of The Confluence With Sugar Creek
Track L & N Reservoir 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 L & N Reservoir
Where does the data for L & N Reservoir 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 High 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 L & N Reservoir.