James Donnell Lake No 2 Dam dam
James Donnell Lake No 2 Dam
James Donnell Lake No 2 Dam in McMullen, Texas, is a private-owned structure completed in 1968 primarily for water supply purposes. This earth-type dam stands at a height of 17 feet and spans a length of 860 feet along the TR-PRAIRIE CREEK. Despite its age, the dam has a normal storage capacity of 58 acre-feet and a maximum storage of 165 acre-feet, making it a crucial water resource in the region.
The dam's design includes a buttress core and is situated in a high-risk area, as indicated by its Hazard Potential rating of "Not Available" and a Risk Assessment of "High (2)". Although the dam is not regulated by the state, it undergoes regular inspections and is equipped with one outlet gate. With no spillway and a lack of inundation maps, the dam poses potential risks in the event of emergencies, highlighting the importance of effective risk management measures and emergency preparedness.
In an era of increasing climate variability, the James Donnell Lake No 2 Dam serves as a vital infrastructure for water storage and supply in the region. Its presence not only supports the local community but also underscores the need for continued monitoring, maintenance, and preparedness to ensure the safety and sustainability of this essential water resource in Texas.
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 James Donnell Lake No 2 Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| San Miguel Ck Nr Tilden | 6 cfs | → |
| Frio Rv At Tilden | 0 cfs | → |
| Nueces Rv Nr Tilden | 111 cfs | → |
| Atascosa Rv At Whitsett | 194 cfs | → |
| Frio Rv Nr Derby | · | → |
| Choke Canyon Res Owc Nr Three Rivers | 37 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near James Donnell Lake No 2 Dam.
Campgrounds
Track James Donnell Lake No 2 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 James Donnell Lake No 2 Dam
Where does the data for James Donnell Lake No 2 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 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 James Donnell Lake No 2 Dam.