City Lake No 1 Dam dam
City Lake No 1 Dam
City Lake No 1 Dam, located in Thornedale, Texas, was completed in 1955 and stands at a height of 20 feet, with a length of 700 feet. Designed by Marvin Turner, this dam sits on the Berry Branch river and is primarily used for recreational purposes. With a storage capacity of 282 acre-feet, it covers a surface area of 19.2 acres and has a maximum discharge of 5543 cubic feet per second.
Despite its age, City Lake No 1 Dam has a poor condition assessment as of November 2015, indicating the need for maintenance and improvements. The dam features an uncontrolled spillway and one outlet gate. Its hazard potential is currently labeled as "Not Available", but the risk assessment is rated as moderate. The dam is privately owned and regulated by the Texas Commission on Environmental Quality (TCEQ), with state inspection, permitting, and enforcement in place.
Water resource and climate enthusiasts may find City Lake No 1 Dam an intriguing structure to study, given its historical significance and the potential risks associated with its current condition. As a vital part of the region's water management system, continued monitoring and maintenance of this dam will be crucial to ensure the safety of surrounding communities and the preservation of the environment.
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 City Lake No 1 Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| San Gabriel Rv At Laneport | 1,650 cfs | → |
| Willis Ck Nr Granger | 60 cfs | → |
| Little Rv Nr Rockdale | 951 cfs | → |
| Little Rv At Cameron | 5,290 cfs | → |
| Brushy Ck At Kenney Fort Blvd At Round Rock | 155 cfs | → |
| Big Elm Ck At Sh 77 Nr Cameron | 932 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near City Lake No 1 Dam.
Boat launches
- Williamson County
- County Road 347 1520, Granger
- Lake Pflugerville Park
- Lake Overlook Road 598, Georgetown
- Cedar Breaks Park Road, Georgetown
- Park Road 3, Georgetown
Campgrounds
- Wilson Fox - Granger Lake
- Taylor - Granger Lake
- Willis Creek - Granger Lake
- Berry Springs Park And Preserve
- North Shore Park - Lake Bastrop
- Cedar Breaks - Lake Georgetown
Track City Lake No 1 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 City Lake No 1 Dam
Where does the data for City Lake No 1 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 City Lake No 1 Dam.