Diascund Reservoir Off Dam
New Kent County, Virginia1,100 acresView mapDirections
Virginia DEQ publishes the water-quality measurements for Diascund Reservoir Off Dam. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- Public access
Diascund Reservoir Off Dam in New Kent County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 11.5 µg/L. Surface area: 1100 acres.
Diascund Reservoir Off Dam is a 1,100-acre productive, nutrient-rich eutrophic lake in New Kent County, Virginia. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in New Kent County, Diascund Reservoir Off Dam ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2022-10-06. Methodology: how these readings are compared.
Diascund Reservoir Off Dam covers about 1,100 acres in New Kent County. It has one public boat landing. Vrbo is where to look for cabins and lake homes around Diascund Reservoir Off Dam, and Booking.com and Expedia search hotels near the lake for your dates.
What Diascund Reservoir Off Dam is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water1,100 acres
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Diascund Reservoir Off Dam is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Diascund Reservoir Off Dam is safe to swim in today is a call for the Virginia Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Diascund Reservoir Off Dam
These are the measurements Virginia DEQ publishes for Diascund Reservoir Off Dam, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3 ft of visibility. Phosphorus 30 µg/L. Chlorophyll-a 11.5 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 30µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 11.5µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Diascund Reservoir Off Dam
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
1,100 acres
Public access
Yes
Listed by Virginia DEQ
No bathymetric survey has been published for Diascund Reservoir Off Dam, so its depth is not documented here.
Recreation & Access
- Diascund LandingPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Diascund Reservoir Off Dam
Compare lakeside cabins, hotels, and vacation rentals near Diascund Reservoir Off Dam in New Kent County, Virginia — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Diascund Reservoir Off Dam
Water Quality Trend: Improving
Based on 4 years of monitoring (2015–2022).
Water clarity
Improving4 years
Phosphorus
Improving-2.57 µg/L/yr4 years
Chlorophyll-a
Improving-0.56 µg/L/yr4 years
Reservoir Info (USACE NID)
Diascund Reservoir Off Dam is a man-made reservoir impounded by the Diascund Creek Dam, built primarily for water supply on the Diascund Creek; earth-type dam, 35 ft tall and 5,000 ft long.
- Surface area
- 1,100 ac
- Normal storage
- 11,355 ac-ft
- Max storage
- 29,093 ac-ft
- Drainage area
- 44.16 sq mi
- Hazard class
- High
- Owner
- City of Newport News
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID VA127003 · Operator website · Matched by proximity (0.1 km)
EPA Impairment Status
Diascund Reservoir Off Dam is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit VAP-G09L_DSC01A00 · Official waterbody report
Nearby Lakes in New Kent County
Frequently asked questions about Diascund Reservoir Off Dam
Where is Diascund Reservoir Off Dam?
- Diascund Reservoir Off Dam is a lake in New Kent County, Virginia. Its water-quality measurements are published by Virginia DEQ and shown on this page as reported.
What is the water quality of Diascund Reservoir Off Dam?
- Diascund Reservoir Off Dam in New Kent County, Virginia has water-quality measurements published by Virginia DEQ, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 11.5 µg/L. Surface area: 1100 acres.
Is Diascund Reservoir Off Dam safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Diascund Reservoir Off Dam is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Are there boat ramps on Diascund Reservoir Off Dam?
- Diascund Reservoir Off Dam has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Diascund Landing. Public access is listed as yes.
Can I fish at Diascund Reservoir Off Dam?
- Diascund Reservoir Off Dam has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Virginia's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
110 measurements from 1 monitoring station, 2015–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB110 samples · 2015–2022
Analytical methods
- Tyler, John. 1968. The secchi disk, Limnology and Oceanograpy, 13(1):1-6.
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory