Diascund Reservoir Off Dam
New Kent County, Virginia1,100 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- Impaired · Mercury
- #1 of 2 in the county
- Public access
Diascund Reservoir Off Dam in New Kent County, Virginia has a water quality grade of B (Good). Water clarity: 3 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 11.5 µg/L. Surface area: 1100 acres.
- Clarity
- 3 ft
- Area
- 1,100 acres
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Chlorophyll-a
- 11.5 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Diascund Reservoir Off Dam is a 1,100-acre productive, nutrient-rich eutrophic lake in New Kent County, Virginia. Water quality is graded B based on 2 sampling years through 2022. 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. Grade methodology: LakeQuality methodology.
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 Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, 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.
Water Quality Grade: B (Good)
Very murky, less than 3 ft of visibility. Phosphorus 30 µg/L. Chlorophyll-a 11.5 µg/L. TSI 56. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 30 µg/L | Good |
| Chlorophyll-a (Algae) | 11.5 µg/L | Good |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,100 acres |
| Public Access | Yes |
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
Fishing Diascund Reservoir Off Dam
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.061 m/yr | 4 |
| Phosphorus | ↑ Improving | -2.57 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.56 µg/L/yr | 4 |
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
Source: EPA ATTAINS assessment unit VAP-G09L_DSC01A00 · Official waterbody report · Matched by proximity (1.89 km)
County Ranking
Ranked #1 of 2 lakes in New Kent County
Nearby Lakes With Higher Grades
Diascund Reservoir Off Dam holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Diascund Reservoir Off Dam?
- Diascund Reservoir Off Dam in New Kent County, Virginia has a water quality grade of B (Good). 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?
- The B is nutrients and algae, 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.
Explore Diascund Reservoir Off Dam across LakeQuality
More Virginia Lake Rankings
Other Grade B Lakes in Virginia
Eutrophic Lakes in Virginia
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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