Kalnasy Dam dam
Kalnasy Dam
Kalnasy Dam, located in Loudoun, Virginia, is a vital water resource structure that serves multiple purposes, including irrigation and recreation. Managed by the Department of Conservation and Recreation, this earth dam stands at a height of 26.1 feet and stretches 360 feet in length, providing a storage capacity of 116.1 acre-feet. Situated on the South Fork Catoctin Creek tributary, the dam's primary function is for recreational use, offering a surface area of 7.36 acres for visitors to enjoy.
Despite its fair condition assessment and high hazard potential, Kalnasy Dam is regularly inspected to ensure its structural integrity and the safety of those in its vicinity. The last inspection in February 2018 revealed no immediate concerns, with a defined emergency action plan in place. With state regulatory agencies overseeing its operation, permitting, and enforcement, the dam continues to play a crucial role in water management within the region. As climate change impacts water resources, dams like Kalnasy are essential for maintaining water supply and mitigating risks associated with extreme weather events.
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 Kalnasy Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| S F Catoctin Creek At Rt 698 Near Waterford | 4 cfs | → |
| N F Catoctin Creek At Rt 681 Near Waterford | 4 cfs | → |
| Limestone Branch Near Leesburg | 2 cfs | → |
| N F Goose Creek At Rt 729 Near Lincoln | 9 cfs | → |
| Catoctin Creek At Taylorstown | 17 cfs | → |
| Beaverdam Creek At Rt 734 Near Mountville | 6 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Kalnasy Dam.
Boat launches
- Smart's Mill Rd (Private) Leesburg
- Chesapeake And Ohio Canal Trail Point Of Rocks
- Edwards Ferry Road Montgomery County
- South Maple Avenue 105, Brunswick
- Petersville Road Brunswick
- Shannondale Springs Road 199, Jefferson County
Campgrounds
- Turtle Run
- Turtle Run Campsite
- Marble Quarry Hiker-Biker Campsite
- Marble Quarry
- Locust Grove
- Leave No Trace
Fishing spots
- Culler Lake
- Potomac River Reservoir
- Chesapeake And Ohio Canal
- Washington Aqueduct
- Dalecarlia Reservoir
- Gillam Branch (Historical)
Paddle runs
- Headwaters Adjacent To Fdt 573 To State Route 622 Bridge
- Bixler Bridge On State Route 675 To Karo Landing, Approximately 6 Miles South Of Town Of Front Royal
- State Route 675 At Edinburg, Va To State Highway 55 Southeast Of Strasburg, Va
- Segment C--Nf Boundary To Confluence With North Fork Shenandoah River
- Segment B--State Route 730 Bridge To Nf Boundary
- Capon Bridge To Ends Just South Of Largent
Track Kalnasy 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 Kalnasy Dam
Where does the data for Kalnasy 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 High 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 Kalnasy Dam.