Johnston Dam No 1 dam
Johnston Dam No 1
Johnston Dam No 1, located in Harrison, Texas, was completed in 1950 for the primary purpose of irrigation along the TR-BIG MASON CREEK. This private earth dam stands at a height of 20 feet and has a length of 700 feet, providing a storage capacity of 260 acre-feet. Despite its age, the dam's condition assessment is not rated, with a high risk potential noted, making it a subject of interest for water resource and climate enthusiasts.
The dam, designed as an earth buttress structure, does not have a spillway and is not regulated by the state. With no inspections or enforcement in place, the dam's operational and safety aspects remain unclear. The lack of hazard potential assessment and emergency preparedness further add to the intrigue surrounding Johnston Dam No 1, making it a notable feature in the water resource landscape.
As water scarcity and climate change continue to impact regions like Texas, understanding the state of dams like Johnston Dam No 1 becomes crucial in ensuring water security and disaster resilience. Despite its historical significance in irrigation, the dam's condition and risk assessment raise questions about its long-term viability and the need for proactive management measures to address potential hazards. For enthusiasts interested in water resource management and climate adaptation, Johnston Dam No 1 presents a case study worth exploring in the context of evolving environmental challenges.
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 Johnston Dam No 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sabine Rv Bl Longview | 356 cfs | → |
| Sabine Rv Abv Longview | 298 cfs | → |
| Little Cypress Ck Nr Ore City | 69 cfs | → |
| Rabbit Ck At Kilgore | 8 cfs | → |
| Sabine Rv Nr Gladewater | 267 cfs | → |
| Big Cypress Ck Nr Jefferson | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Johnston Dam No 1.
Boat launches
- Estes Parkway 5001, Lakeport
- Tx 149 Easton
- Boat Launch Road Harrison County
- South Tyler Street 901, Gladewater
- Marion County
Campgrounds
- Martin Creek Lake State Park
- Bee Tree Camping Loop
- Broken Bowl Camping Area
- Shelter Camping Area
- Brushy Creek - Lake Of The Pines
- Buckhorn Creek Campground
Fishing spots
Track Johnston Dam No 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 Johnston Dam No 1
Where does the data for Johnston Dam No 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 Not Available 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 Johnston Dam No 1.