Keystone Lake: water quality

Lake · Florida · Keystone, 0.9 mi away

Keystone Lake, Florida: .

Lake

Surface area: 434 acres0.7 mi²from the mapped waterbody polygon; varies with water level
Shoreline: 7.9 mimapped boundary length, bays and islands included
Maximum depth: 19 ftpublished figure, LAGOS-US DEPTH v1.0 (no bottom map)
Shoreline development: 2.71
Fish species: 19
Access: open to the public
Nearest town: Keystone0.9 mi

Water claritynow 4.6 ft

Keystone Lake: water quality

Boat: Plan for shore fishing or a car-top boat.

The lake

Keystone Lake covers 434 acres in Florida, across Hillsborough County. It is a lake. Our records hold 19 species for this water.

Water and conditions

Water clarity runs 4–7 feet on our readings, averaging 5.4 feet, from 235 readings. Our water temperature readings average 82°F; they do not cover the whole year, so this is not a yearly average. pH averages 6.9. These readings span 2018–2025.

What is hard here

Everything here starts from the bank or a boat you can carry. Alligators live in Florida fresh water. Keep clear of the bank edge at dawn and dusk, and keep pets away from it.

Cyanobacteria from satellite — EPA CyAN

The EPA's Cyanobacteria Assessment Network estimates cyanobacteria from Sentinel-3 satellite images. This is the latest image in which the water was visible through the clouds.

Image date: October 28, 2026
Highest level over at least 1% of the water: Below detection

A satellite estimate with 300 m pixels, not a water sample; pixels near the shore are masked. Levels are CyAN's own scale: low below 100,000 cells/mL, medium up to about 300,000, high up to about 1,000,000, very high above that. EPA Cyanobacteria Assessment Network (CyAN), Sentinel-3 OLCI satellite imagery — public domain

State monitoring data: 687 readings from 7 stations. Shown are the full-period range, the mean and the latest sample.

Temperature

82.18°Fmean

warm

min 80.42max 87.08

latest 87.08 °F · Jun 10, 2025

72–82 °F puts warm-water fish at their best, though the water holds less oxygen than it does in winter.

4 readings · 2025–2025

Oxygen

7.68mg/Lmean

adequate

min 7.33max 7.9

latest 7.33 mg/L · Jun 10, 2025

5–8 mg/L is enough for every warm-water game fish.

4 readings · 2025–2025

6.89mean

in range

min 6.83max 6.98

latest 6.89 · Jun 10, 2025

6.5–8.5 is the band in which the vast majority of game fish live.

4 readings · 2025–2025

Clarity

5.38ftmean

clear

min 2max 10.3

latest 2.62 ft · Jun 10, 2025

Over five feet — clear water. Fish are wary, so a finer leader and a longer cast pay off.

235 readings · 2018–2025

Samples are taken irregularly and at different points of the water body, so the mean describes the water as a whole, not one spot on one day.

State assessment in its 2024 report

How the state rated this water in its Clean Water Act report to the EPA.

KEYSTONE LAKE · 2024 report · Florida · state report

Recreation: Fully supporting
Aquatic life: Fully supporting

EPA ATTAINS — state water quality assessments under the Clean Water Act (303(d)/305(b)), public domain

These are past samples, not a safety check. Before swimming, eating your catch or going out on ice, check current conditions with local health and wildlife authorities.

Campgrounds by Keystone Lake — closest to the water first. Tap a row to see it on the map; the link goes to the campground's official page.

Campground	Run by	To the water	Official page
Shuck	—	0.7 mi	—
Pioneer	—	0.7 mi	—
West	—	0.7 mi	—
Indian	—	0.8 mi	—
Meninak	—	0.8 mi	—
Beard	—	0.9 mi	—
Seton	—	0.9 mi	—
Eagle's Nest	—	0.9 mi	—
Baden Powell	—	0.9 mi	—
Civitan	—	0.9 mi	—
Sagamore	—	1 mi	—
Seneca	—	1 mi	—