Patch Reservoir
Worcester County, Massachusetts34 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Limited data
Patch Reservoir in Worcester County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 34 acres.
Patch Reservoir is a 34-acre lake in Worcester County, Massachusetts.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2020-10-30. 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 Patch Reservoir is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Patch Reservoir
These are the measurements MassDEP publishes for Patch Reservoir, 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 Patch Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
34 acres
No bathymetric survey has been published for Patch Reservoir, so its depth is not documented here.
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Fishing Patch Reservoir
Reservoir Info (USACE NID)
Patch Reservoir is a man-made reservoir impounded by the Patch Reservoir Dam (completed 1896), built primarily for recreation on the Tatnuck Brook; masonry-type dam, 8 ft tall and 70 ft long.
- Surface area
- 34 ac
- Normal storage
- 85 ac-ft
- Max storage
- 187 ac-ft
- Drainage area
- 9.72 sq mi
- Hazard class
- High
- Owner
- City of Worcester
Source: USACE National Inventory of Dams, NID ID MA00122 · Operator website
Nearby Lakes in Worcester County
Frequently asked questions about Patch Reservoir
Where is Patch Reservoir?
- Patch Reservoir is a lake in Worcester County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Patch Reservoir?
- Patch Reservoir in Worcester County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 34 acres.
Is Patch Reservoir 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
19 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS19 samples · 2020
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.