Green Lane Reservoir
Montgomery County, Pennsylvania779 acresView mapDirections
PA DEP publishes the water-quality measurements for Green Lane Reservoir. Here is what has been measured.
- Hypereutrophic
- Impaired · Oxygen depletion (low DO)
Green Lane Reservoir in Montgomery County, Pennsylvania has water-quality measurements published by PA DEP, shown here as reported. Phosphorus: 146 µg/L. Chlorophyll-a (algae): 45.6 µg/L. Surface area: 779 acres.
Green Lane Reservoir is a 779-acre highly nutrient-loaded hypereutrophic lake in Montgomery County, Pennsylvania.
Source: EPA Water Quality Portal sampling records, PA DEP, last sampled 2025-07-29. Methodology: how these readings are compared.
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Green Lane Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for oxygen depletion (low DO). Check local advisories before you swim.
Whether Green Lane Reservoir is safe to swim in today is a call for the Pennsylvania Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Green Lane Reservoir
These are the measurements PA DEP publishes for Green Lane 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. Phosphorus 146 µg/L. Chlorophyll-a 45.6 µg/L.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 146µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 45.6µg/L | Poor GoodFairPoor |
Very high nutrients, dense algae, poor clarity
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Lake Details
Surface area
779 acres
Shoreline
19.8 mi
No bathymetric survey has been published for Green Lane Reservoir, so its depth is not documented here.
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Stays near Green Lane Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Green Lane Reservoir in Montgomery County, Pennsylvania — 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Green Lane Reservoir are listed below.
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Fishing Green Lane Reservoir
EPA Impairment Status
Green Lane Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit PA-LRP-02040203008646 · Official waterbody report
Nearby Lakes in Montgomery County
Frequently asked questions about Green Lane Reservoir
Where is Green Lane Reservoir?
- Green Lane Reservoir is a lake in Montgomery County, Pennsylvania. Its water-quality measurements are published by PA DEP and shown on this page as reported.
What is the water quality of Green Lane Reservoir?
- Green Lane Reservoir in Montgomery County, Pennsylvania has water-quality measurements published by PA DEP, shown here as reported. Phosphorus: 146 µg/L. Chlorophyll-a (algae): 45.6 µg/L. Surface area: 779 acres.
Is Green Lane Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Green Lane Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for oxygen depletion (low DO). Check local advisories before you swim.
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Where this data comes from
Measurements for Green Lane Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
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
Impairment status from EPA ATTAINS 303(d) database