Flagg Pond
Caledonia County, VermontView mapDirections
No nutrient or algae sampling on record from Vermont DEC for this lake.
- 17 ft max depth
- Limited data
Flagg Pond in Caledonia County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Flagg Pond is a lake in Caledonia County, Vermont with an estimated average depth of about 17 feet.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2023-05-10. Methodology: how these readings are compared.
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Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Flagg Pond is safe to swim in today is a call for the Vermont Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Flagg Pond
These are the measurements Vermont DEC publishes for Flagg Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Flagg Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~17 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Flagg Pond.
Lake Size & Watershed
Watershed (drainage) area
4 sq mi
HydroLAKES / HydroSHEDS
Surface area
99 acres
HydroLAKES / HydroSHEDS
Shoreline
1.9 mi
HydroLAKES / HydroSHEDS
Elevation
1,591 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Frequently asked questions about Flagg Pond
Where is Flagg Pond?
- Flagg Pond is a lake in Caledonia County, Vermont. Its water-quality measurements are published by Vermont DEC and shown on this page as reported.
What is the water quality of Flagg Pond?
- Flagg Pond in Caledonia County, Vermont has water-quality measurements published by Vermont DEC, shown here as reported.
Is Flagg Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Flagg Pond?
- No published bathymetric survey covers Flagg Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 17 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
5 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ5 samples · 2021–2023
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 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
Lake size & watershed from HydroLAKES (HydroSHEDS)