Cohoke Millpond
King William County, VirginiaView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- Impaired · Oxygen depletion (low DO)
- #1 of 1 in the county
- Public access
- Limited data
Cohoke Millpond in King William County, Virginia has a water quality grade of D (Nutrient-rich). Phosphorus: 65 µg/L.
- Type
- Eutrophic
- Phosphorus
- 65 µg/L
- Public access
- Yes
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Stays near Cohoke Millpond
Compare lakeside cabins, hotels, and vacation rentals near Cohoke Millpond in King William 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Cohoke Millpond are listed below.
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Watch Cohoke Millpond’s letter
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Cohoke Millpond is a productive, nutrient-rich eutrophic lake in King William County, Virginia. Water quality is graded D based on 1 sampling years through 2020. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Virginia DEQ, last sampled 2020-12-29. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 D is nutrients and algae, not a swimming clearance. Cohoke Millpond is listed impaired under Clean Water Act §303(d) (IR 4A) for oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 65 µg/L. TSI 64. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 65 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Cohoke Millpond
Reservoir Info (USACE NID)
Cohoke Millpond is a man-made reservoir impounded by the Cohoke Mill Dam, built primarily for recreation on the Cohoke Mill Creek; earth-type dam, 9 ft tall and 1,100 ft long.
- Normal storage
- 183 ac-ft
- Max storage
- 723 ac-ft
- Drainage area
- 16.28 sq mi
- Hazard class
- Undetermined
Source: USACE National Inventory of Dams, NID ID VA101004 · Operator website · Matched by proximity (0.07 km)
EPA Impairment Status
Cohoke Millpond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VAP-F14E_CMC01A06 · Official waterbody report · Matched by proximity (0.54 km)
County Ranking
Ranked #1 of 1 lakes in King William County
Nearby Lakes With Higher Grades
Cohoke Millpond holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in King William County
Frequently asked questions about Cohoke Millpond
Where is Cohoke Millpond?
- Cohoke Millpond is a lake in King William County, Virginia. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Cohoke Millpond?
- Cohoke Millpond in King William County, Virginia has a water quality grade of D (Nutrient-rich). Phosphorus: 65 µg/L.
Is Cohoke Millpond safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Cohoke Millpond is listed impaired under Clean Water Act §303(d) (IR 4A) for oxygen depletion (low DO). Check local advisories before you swim.
Explore Cohoke Millpond across LakeQuality
More Virginia Lake Rankings
Other Grade D Lakes in Virginia
Eutrophic Lakes in Virginia
Where this data comes from
10 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
21VASWCB10 samples · 2020
Analytical methods
- Total Phosphorus After Block Digestion
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