Grattan Dam dam
Grattan Dam
Grattan Dam, located in Goochland, Virginia, is a private water resource structure regulated by the Department of Conservation and Recreation. The dam stands at a height of 30 feet with a hydraulic height matching that figure, and a length of 315 feet. Its primary purpose and dam type are unspecified, but it boasts a maximum storage capacity of 129.96 acre-feet and a normal storage level of 68.34 acre-feet, covering a surface area of 6.7 acres. Although its condition assessment is listed as "Not Rated" and its hazard potential is deemed "Undetermined", the dam is subject to state regulation, inspection, and enforcement to ensure its safety and compliance.
Grattan Dam, nestled in the Norfolk District, has not been modified over the years and lacks specific data on its completion year or spillway type. Despite its current condition assessment and hazard potential remaining unclassified, the dam undergoes frequent inspections every year. While emergency response preparedness details are not provided, the structure's risk assessment, management measures, and inundation maps status are also undisclosed. Grattan Dam's emergency action plan adherence and compliance with guidelines have not been verified, yet its overall risk characterization and DSAC assignment date are not specified.
In the picturesque landscape of Goochland, Virginia, Grattan Dam stands as a private water resource structure with a significant storage capacity and a crucial role in the state's water management. The dam's lack of specific details on certain operational aspects and risk management measures may raise questions among water resource and climate enthusiasts, but its regulation by the Department of Conservation and Recreation ensures that it meets state standards and undergoes regular inspections to maintain public safety and environmental integrity. With its scenic location and vital function in the local water system, Grattan Dam remains an intriguing feature for those interested in water resources and climate 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 Grattan Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| James River At Cartersville | 1,580 cfs | → |
| Fine Creek At Fine Creek Mills | 2 cfs | → |
| Appomattox River At Mattoax | 115 cfs | → |
| James River And Kanawha Canal Near Richmond | 137 cfs | → |
| Rivanna River At Palmyra | 102 cfs | → |
| Slate River Near Arvonia | 65 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grattan Dam.
Track Grattan 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 Grattan Dam
Where does the data for Grattan 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 Undetermined 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 Grattan Dam.