Myrtle Grove Lake
Charles County, Maryland23 acresView mapDirections
MDE publishes the water-quality measurements for Myrtle Grove Lake. Here is what has been measured.
- Limited data
Myrtle Grove Lake in Charles County, Maryland has water-quality measurements published by MDE, shown here as reported. Water clarity: 2.6 ft visibility. Surface area: 23 acres.
Myrtle Grove Lake is a 23-acre lake in Charles County, Maryland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-03-10. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Myrtle Grove Lake is safe to swim in today is a call for the Maryland Department of the Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Myrtle Grove Lake
These are the measurements MDE publishes for Myrtle Grove Lake, 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 2.6 ft of visibility. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 63 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Myrtle Grove Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
23 acres
No bathymetric survey has been published for Myrtle Grove Lake, so its depth is not documented here.
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Fishing Myrtle Grove Lake
Reservoir Info (USACE NID)
Myrtle Grove Lake is a man-made reservoir impounded by the Myrtle Grove Lake (completed 1965), built primarily for recreation on the Mattawoman Creek-TR; earth-type dam, 14 ft tall and 1,800 ft long.
- Surface area
- 23 ac
- Normal storage
- 88 ac-ft
- Max storage
- 192 ac-ft
- Drainage area
- 2.3 sq mi
- Hazard class
- Low
- Owner
- MD DNR-Public Lands, Engineering & Constr-Southern
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID MD00183 · Operator website
Nearby Lakes in Charles County
Frequently asked questions about Myrtle Grove Lake
Where is Myrtle Grove Lake?
- Myrtle Grove Lake is a lake in Charles County, Maryland. Its water-quality measurements are published by MDE and shown on this page as reported.
What is the water quality of Myrtle Grove Lake?
- Myrtle Grove Lake in Charles County, Maryland has water-quality measurements published by MDE, shown here as reported. Water clarity: 2.6 ft visibility. Surface area: 23 acres.
Is Myrtle Grove Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
47 measurements from 2 monitoring stations, 2019–2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples47 samples · 2019–2020
Monitoring station identifiers (2)
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.