Petersen Site 1 Lake dam
Petersen Site 1 Lake
Petersen Site 1 Lake, located in Gillespie, Texas, serves primarily for irrigation purposes and was completed in 1963. This Earth dam stands at a height of 28 feet with a length of 360 feet, providing a storage capacity of 75 acre-feet. Situated along Riley Creek, this private-owned reservoir does not have a spillway and is not regulated by the state for enforcement. Despite being last inspected in 1976, the dam's hazard potential is not available, indicating a need for further assessment.
With its location in the Galveston District and under the ownership of a private entity, Petersen Site 1 Lake presents a unique opportunity for water resource and climate enthusiasts to explore the intersection of human infrastructure with natural water systems. The dam's high risk assessment highlights the importance of monitoring and maintaining such structures to prevent potential hazards. By delving into the historical context and design characteristics of this reservoir, enthusiasts can gain valuable insights into the challenges and considerations involved in managing water resources for agricultural purposes.
As a key component of the regional water system, Petersen Site 1 Lake offers a case study for evaluating the resilience and sustainability of irrigation infrastructure in the face of changing climate conditions. Understanding the dam's structural integrity, storage capacity, and operational mechanisms can provide valuable lessons for optimizing water management practices and ensuring the long-term viability of water resources in Texas. By engaging with the data and characteristics of this reservoir, enthusiasts can deepen their appreciation for the complex interplay between human activities and natural systems in shaping the future of water resource management.
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 Petersen Site 1 Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pedernales Rv Nr Fredericksburg | 5 cfs | → |
| Sandy Ck Nr Kingsland | 45 cfs | → |
| Beaver Ck Nr Mason | 2 cfs | → |
| Llano Rv At Llano | 87 cfs | → |
| Pedernales Rv Nr Johnson City | 7 cfs | → |
| Llano Rv Nr Mason | 108 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Petersen Site 1 Lake.
Boat launches
- Cr 102 Scotts Slab. Llano River Access.
- The Trails Parkway Horseshoe Bay
- Us 281 Blanco County
- Park Terrace 599, Sunrise Beach Village
- Kingsland Lions Park. Lake Lyndon B. Johnson
- Wayne Smith Dam, Blanco
Campgrounds
- Enchanted Rock State Natural Area
- Lady Bird Johnson City Park
- Peach Country Rv Park
- Lbj Volunteer Campground
- Badu Park
- Buckhorn Lake Rv Resort
Fishing spots
Track Petersen Site 1 Lake 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 Petersen Site 1 Lake
Where does the data for Petersen Site 1 Lake 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 Petersen Site 1 Lake.