Sysladobsis Lake
Washington County, Maine5,400 acresView mapDirections
Maine DEP publishes the water-quality measurements for Sysladobsis Lake. Here is what has been measured.
- Oligotrophic
- Limited data
Sysladobsis Lake in Washington County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Water clarity: 27.8 ft visibility. Phosphorus: 6 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 5400 acres.
Sysladobsis Lake is a 5,400-acre cold, clear oligotrophic lake in Washington County, Maine. Overall water quality is declining over recent sampling years. Compared to the 10 other monitored lakes in Washington County, Sysladobsis Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-27. Methodology: how these readings are compared.
What Sysladobsis Lake is good for
From access and monitoring records, not editorial picks.
- Clear water27.8 ft of visibility
- Big water5,400 acres
Swimming conditions
Readings onlyLimited data
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. Check local advisories before you swim.
Whether Sysladobsis Lake is safe to swim in today is a call for the Maine Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sysladobsis Lake
These are the measurements Maine DEP publishes for Sysladobsis Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 27.8 ft down. Phosphorus 6 µg/L. Chlorophyll-a 2 µg/L. TSI 32.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 27.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 6µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 32 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Sysladobsis Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
5,400 acres
No bathymetric survey has been published for Sysladobsis Lake, so its depth is not documented here.
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Stays near Sysladobsis Lake
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Fishing Sysladobsis Lake
Water quality readings over time
2 seasons of samples on record (2021–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Worsening+0.5 µg/L/yr2 years
Chlorophyll-a
Improving-1 µg/L/yr2 years
Reservoir Info (USACE NID)
Sysladobsis Lake is a man-made reservoir impounded by the Sysladobsis Lake (completed 1861), built primarily for hydroelectric on the West Branch St. Croix River; earth-type dam, 9 ft tall and 250 ft long.
- Surface area
- 5,400 ac
- Normal storage
- 123,555 ac-ft
- Max storage
- 123,555 ac-ft
- Drainage area
- 162 sq mi
- Hazard class
- Low
- Owner
- Woodland Pulp, LLC
Source: USACE National Inventory of Dams, NID ID ME00602 · Operator website
Nearby Lakes in Washington County
Frequently asked questions about Sysladobsis Lake
Where is Sysladobsis Lake?
- Sysladobsis Lake is a lake in Washington County, Maine. Its water-quality measurements are published by Maine DEP and shown on this page as reported.
What is the water quality of Sysladobsis Lake?
- Sysladobsis Lake in Washington County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Water clarity: 27.8 ft visibility. Phosphorus: 6 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 5400 acres.
Is Sysladobsis Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Sysladobsis Lake across LakeQuality
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Other Lakes in Maine
Oligotrophic Lakes in Maine
Where this data comes from
22 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples22 samples · 2021–2022
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.