Rock Lake Dam dam
Rock Lake Dam
Rock Lake Dam in Montana, completed in 1960, stands as a concrete structure with a multi-arch core foundation on Rock Creek. The dam measures 6.33 feet in height and serves as an essential water resource for the surrounding area, with a storage capacity of 1563 acre-feet. Despite being privately owned, the state of Montana regulates and inspects the dam to ensure its safety and compliance. The dam's spillway type is uncontrolled, and it is equipped with valve outlet gates.
Although Rock Lake Dam has a low hazard potential and a moderate risk assessment rating, its condition assessment has not been rated. The dam's emergency action plan status and risk management measures remain unreported, highlighting a potential area for improvement. Located in Park County, Montana, this dam plays a crucial role in water resource management and climate resilience efforts in the region. Enthusiasts of water resources and climate change should keep an eye on Rock Lake Dam for updates on its safety, maintenance, and regulatory compliance.
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 Rock Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Shields River Nr Livingston Mt | 293 cfs | → |
| Boulder River At Big Timber Mt | 859 cfs | → |
| South Fork Musselshell R Ab Martinsdale Mt | 43 cfs | → |
| Yellowstone River Near Livingston Mt | 6,770 cfs | → |
| Musselshell River Nr Martinsdale | 169 cfs | → |
| Musselshell River At Harlowton Mt | 214 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Rock Lake Dam.
Boat launches
- North Yellowstone Trail Road Sweet Grass County
- Park County
- Us 89 Park County
- Howie Road Sweet Grass County
Campgrounds
- Halfmoon Campground
- Ibex Cabin
- Porcupine Cabin
- Shields River Dispersed Site
- Crandall Creek Cabin
- Grey Bear Fas
Fishing spots
Paddle runs
- Gallatin Forest Boundary, Sec. 26, T3s, R12e To Blakley Creek, Sec. 26, T3s, R12e
- Blakley Creek, Sec. 26, T4s, R12e To Miller Creek, Sec 13, T4s, R21e
- Miller Creek, Sec. 13, T4s, R21e To Bramble Creek, Sec. 26, T5s, R12e
- Bad Canyon Creek
- Bible Run
More reservoirs
Track Rock Lake 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 Rock Lake Dam
Where does the data for Rock Lake 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 Low 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 Rock Lake Dam.