C

Putnam-Riley Lake

Putnam County, FloridaEutrophic

Putnam-Riley Lake is a productive, nutrient-rich eutrophic lake in Putnam County, Florida. Water quality is graded C based on 2 sampling years through 2025. Compared to the 67 other monitored lakes in Putnam County, Putnam-Riley Lake ranks #36 for water quality.

Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-04-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 4.3 ft. Phosphorus level: 22.5 µg/L. Trophic State Index: 53.

Metric	Value	Grade
Water Clarity (Secchi Depth)	4.3 ft	D
Phosphorus	22.5 µg/L	B
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	53	Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #36 of 68 lakes in Putnam County

Cleaner Lakes Within 30 Miles

Putnam-Riley Lake holds Grade C. 2 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Putnam County

Putnam-Blue Lake

Putnam-Star Lake

Alachua-Moss Lake

Alachua-Holden Pond

Little Orange Lake South Shore

More Florida Lake Rankings

Cleanest lakes in Florida

Top 25 by overall water quality score

Best swimming lakes in Florida

Grade A/B + low algae filter

Family fishing lakes in Florida

Panfish-rich, public access

All Florida lakes

Full state directory

Other Grade C Lakes in Florida

Lake Lancaster West

Orange County · Clarity: 3.5 ft

Eastern Lake Outlet

Walton County · Clarity: 4.2 ft

Seminole-Secret Lake

Seminole County · Clarity: 4.5 ft

Seminole County · Clarity: 2.9 ft

Polk-Fannie Lake

Polk County · Clarity: 3.5 ft

Volusia-North Talmadge Lake

Volusia County · Clarity: 4.5 ft

Eutrophic Lakes in Florida

Lake Lancaster West Flagler-Emerald Lake Eastern Lake Outlet Seminole-Secret Lake

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-04-21

Monitoring stations: 3

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