Dam Report

Clifton Forge Dam dam

Virginia, USA Smith Creek Hazard High
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Dam height
52ft
Hazard rating
High
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Clifton Forge Dam -- None dam
Clifton Forge Dam None · Smith Creek
About this dam

Clifton Forge Dam

Clifton Forge Dam, located in Alleghany, Virginia, is a gravity dam constructed in 1949 primarily for water supply purposes. Designed by Gannett Fleming, Inc., this dam stands at a height of 52 feet and has a length of 265 feet, with a storage capacity of 318 acre-feet. Situated on the Smith Creek river, the dam is regulated by the Department of Conservation and Recreation, ensuring that it meets state inspection and enforcement requirements.

With a high hazard potential but a satisfactory condition assessment as of September 2020, Clifton Forge Dam plays a crucial role in water resource management in the region. The dam's normal storage capacity of 160 acre-feet serves the surrounding area, while its location on the Smith Creek river contributes to a drainage area of 12.53 square miles. Despite its age, the dam continues to meet regulatory standards, highlighting its importance in maintaining water supply infrastructure in Virginia.

The presence of Clifton Forge Dam underscores the significance of sustainable water resource management in the face of climate change. As a key structure in the region, it serves as a vital source of water supply while also posing challenges in terms of hazard potential. With regular inspections and satisfactory condition assessments, the dam stands as a testament to effective infrastructure management in ensuring the safety and security of water resources in Alleghany, Virginia.

StateNone
River / streamSmith Creek
NID IDVA005003
Owner typeLocal Government
Primary purposeWater Supply
Dam typeGravity
Year built1949
Dam height52 ft
Dam length265 ft
Max storage318 AF
Normal storage160 AF
Surface area11.0 ac
Drainage area12.5 sq mi
Hazard potentialHigh
ConditionSatisfactory
Last inspectionTue, 01 Sep 2020 00:00:00 GMT

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.
Detailed forecast

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.

Hourly detail

Next 5 days, hour by hour

Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.

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Deep dive

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.

TimeConditionTemp (°F)Snow (in)Rain (in)Humidity (%)Wind (mps)Wind dir
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Long-term outlook

15-day temperature & precipitation

Daily temperatures, snow, and rain projected over the next two weeks.

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Regional inflow

Nearby streamflow gauges

USGS streamgauges around Clifton Forge Dam -- inflows here typically show up in storage 24-72 hours later.

Track Clifton Forge 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.

FAQ

About Clifton Forge Dam

Where does the data for Clifton Forge 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.

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