Johns Dam dam
Johns Dam
Johns Dam in Potosi, Missouri, is a privately owned Earth dam with a buttress core type that was completed in 2000. Situated on John's Creek, this dam stands at a height of 33 feet and has a storage capacity of 483 acre-feet, with a normal storage of 253 acre-feet. The dam serves the purpose of water resource management and contributes to flood control efforts in the area.
Despite being unregulated by the state and having a low hazard potential, Johns Dam plays a crucial role in the local ecosystem by providing a surface area of 23 acres and draining a watershed area of 1,500 acres. Its strategic location in Washington County, Missouri, ensures that it effectively manages water resources in the region. With no designated spillway and a condition assessment of 'Not Rated,' the dam's structural integrity remains a key consideration for water resource and climate enthusiasts.
With no associated structures or locks and a limited inspection frequency, Johns Dam continues to be an essential feature in the local water infrastructure. Although its risk assessment and emergency preparedness status remain unclear, the dam's contribution to water resource management and flood control in the area cannot be understated. For enthusiasts interested in the intersection of water resources and climate change, Johns Dam offers a fascinating case study of a privately owned structure that plays a vital role in maintaining the ecological balance of the region.
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 Johns Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Big River At Irondale | 40 cfs | → |
| Meramec River Near Sullivan | 596 cfs | → |
| Meramec River Near Steelville | 303 cfs | → |
| Big River Near Richwoods | 332 cfs | → |
| East Fork Black River Nr Lesterville | 5 cfs | → |
| Meramec River At Cook Station | 39 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Johns Dam.
Boat launches
- Council Bluff Lake Trail Washington County
- Enough Boat Launch And Trailhead
- Crawford County
- Bismarch Lake Road St. Francois County
- Meramec State Park Franklin County
- Highway W Franklin County
Campgrounds
Fishing spots
Track Johns Dam 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 Johns Dam
Where does the data for Johns 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 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 Johns Dam.