Johnson dam
Johnson
Johnson is a private dam located in Blount, Tennessee, along the TRIBMOOK CREEK. Built in 2000, this earth dam stands at a structural height of 30 feet, with a hydraulic height of 27 feet, providing fire protection and serving as a stock or small fish pond. With a storage capacity of 100 acre-feet, Johnson is designed for multiple purposes and has a surface area of 8 acres.
Despite being non-regulated by the state, Johnson has a significant hazard potential and is classified as having a moderate risk level. The dam has an uncontrolled spillway type and no outlet gates, with a last inspection date in August 2016. Emergency action plans and risk management measures for Johnson are currently not rated or assessed, highlighting the need for proactive monitoring and maintenance to ensure the safety and integrity of this water resource.
Representing a critical infrastructure for fire protection and water storage, Johnson serves as a reminder of the importance of proper dam management and risk assessment in the face of changing climate patterns and increasing water resource challenges. With its location in a high-risk area and limited regulatory oversight, the ongoing monitoring and maintenance of Johnson are crucial to safeguarding the surrounding community and ecosystem from potential hazards and ensuring the sustainable use of this vital water source.
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 Johnson -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little River Near Maryville | 135 cfs | → |
| Little River Near Alcoa | 131 cfs | → |
| Little River Above Townsend | 93 cfs | → |
| Cheoah River Nr Bearpen Gap Nr Tapoco | 132 cfs | → |
| Little Pigeon River At Sevierville | 162 cfs | → |
| Beaver Creek At Solway | 32 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Johnson.
Boat launches
- Alcoa Water Plant Boat Ramp
- Calderwood Highway 6676, Blount County
- Co Op Road 4406, Rockford
- Topside Road 2317, Louisville
- Calderwood Highway Blount County
- Louisville Boat Ramp
Campgrounds
- #02 Cane Creek
- 2 Cane Creek
- #03 Hesse Creek
- 11 Beard Cane
- Look Rock - Great Smoky Mountains National Park
- Look Rock Campground
Fishing spots
Paddle runs
- Polecat Branch To Snowbird Picnic Area
- Owlcamp Branch To Polecat Branch
- Headwaters Near Mitchell Lick To Owlcamp Branch
- Natahala Powerhouse To Lake Fontana (River Mile 4)
- Tn/Nc State Line (Rm 48.0) To Tn360 Bridge (Rm 30.0)
- Headwaters Near Graham County Line To Nc/Tn State Line
Track Johnson 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 Johnson
Where does the data for Johnson 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.