G.V. "Sonny" Montgomery Lock And Dam - Spillway dam
G.V. "Sonny" Montgomery Lock And Dam - Spillway
The G.V. "Sonny" Montgomery Lock and Dam - Spillway, located in Prentiss, Mississippi, along the Tombigbee River, is a federal-owned structure managed by the US Army Corps of Engineers. Completed in 1984, this gravity dam serves primarily for navigation purposes, with a spillway type of "Controlled" and a width of 225 feet. The dam has a hydraulic height of 37 feet and a structural height of 52 feet, with a length of 5400 feet and a storage capacity of 7700 acre-feet.
Managed by the US Army Corps of Engineers, the dam poses a significant hazard potential with a very high risk assessment rating. To address the risks associated with the dam, the Corps continuously monitors its condition and implements risk management measures such as regular maintenance, repairs, and updating the emergency action plan. The dam plays a crucial role in managing water levels and preventing flood risks, with the Corps working closely with local emergency managers to develop evacuation plans and raise public awareness about the dam's operations.
In the event of severe weather events or excessive water inflow, the dam may release water to maintain structural integrity or manage downstream water levels. While dams cannot eliminate all flood risks, the US Army Corps of Engineers strives to address all types of risks associated with the G.V. "Sonny" Montgomery Lock and Dam - Spillway to ensure the safety of surrounding communities and the structural integrity of the dam.
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 G.V. "Sonny" Montgomery Lock And Dam - Spillway -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Red Bud Creek Nr Moores Mill | 15 cfs | → |
| Twentymile Creek Nr Guntown | 528 cfs | → |
| Cummings Creek Nr Fulton | 13 cfs | → |
| Bear Creek Near Red Bay | 213 cfs | → |
| Tombigbee River Nr Fulton | 834 cfs | → |
| Bull Mountain Creek At Tremont | 80 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near G.V. "Sonny" Montgomery Lock And Dam - Spillway.
Boat launches
- West Levee Service Road Itawamba County
- Tishomingo County
- Piney Point Road Franklin County
- County Road 88 Franklin County
- Elliott Branch
Campgrounds
- Piney Grove Campground
- Natchez Trace Np - Tupelo Bicycle Cg
- Tupelo Bicycle Only Campground
- Williams Hollow Campground
Fishing spots
Track G.V. "Sonny" Montgomery Lock And Dam - Spillway 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 G.V. "Sonny" Montgomery Lock And Dam - Spillway
Where does the data for G.V. "Sonny" Montgomery Lock And Dam - Spillway 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 G.V. "Sonny" Montgomery Lock And Dam - Spillway.