Pm Johnston #1 dam
Pm Johnston #1
Pm Johnston #1, also known as Johnston S Lake, is a private fish and wildlife pond located in Pickens County, Alabama. Constructed in 1975 by the USDA NRCS, this Earth-type dam stands at 30 feet tall and stretches 1200 feet in length. With a storage capacity of 947 acre-feet and a surface area of 100 acres, this reservoir serves as a habitat for fish and wildlife while also offering recreational opportunities.
Situated on TR-SENECA CREEK in the Mobile District, Pm Johnston #1 has a low hazard potential and a moderate risk assessment rating. Its uncontrolled spillway, 60 feet wide, can handle discharge rates of up to 1500 cubic feet per second. While the dam's condition is not currently rated, it is important to note that there are no state regulations or inspections in place for this structure.
Despite its private ownership and lack of state jurisdiction, Pm Johnston #1 plays a crucial role in supporting local ecosystems and providing recreational benefits to the community. As water resource and climate enthusiasts, understanding the infrastructure and management of such dams is essential for ensuring the safety and sustainability of our 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 Pm Johnston #1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tombigbee River At Bevill L&D Nr Pickensville | 1,590 cfs | → |
| Sipsey River Nr Elrod | 357 cfs | → |
| Tombigbee R At Gainesville L&D Nr Gainesville Al | 3,390 cfs | → |
| Noxubee River Nr Geiger | 496 cfs | → |
| Black Warrior River At Northport Al | 2,000 cfs | → |
| Elliotts Creek At Moundville Al | 13 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Pm Johnston #1.
Boat launches
- Pickens County
- Cochrane Access Area Road Pickens County
- Pickensville
- Spurlock Road 2639, Lowndes County
- Greene County
- Binion Creek Landing Park
Campgrounds
- Cochrane
- Sumter Rec Area
- Lock 8
- Lake Lurleen State Park
- Moundville Archaeological Park Campground
- Jennings Ferry
Fishing spots
Track Pm Johnston #1 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 Pm Johnston #1
Where does the data for Pm Johnston #1 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 Pm Johnston #1.