Is GISP2 safe to swim?

As of July 19, 2026, GISP2 in Jefferson County, Louisiana carries a swim caution. Blue-green algae are not currently monitored at this water. No fecal-bacteria advisory is posted (state beach program). Rainfall over the past week totaled 2.0 in, which can wash bacteria and nutrients into the water.

How this read is built

GISP2 is a lake in Jefferson County, Louisiana. Blue-green algae are not currently monitored at this water.

Blue-green algae (cyanobacteria) blooms are most common from midsummer into early fall, when the water is warm, calm, and rich in nutrients from runoff. They can produce toxins that make people sick and can be rapidly fatal to dogs, so skip water that looks green, scummy, or like spilled paint, and keep children and pets out of it.

Is it safe to swim in GISP2 right now?

GISP2 carries a swim caution today. Blue-green algae are not currently monitored at this water. Conditions can change quickly with wind, heat, and rain, so check the posted signs and look at the water before you get in.

Does GISP2 have blue-green algae (cyanobacteria)?

Blue-green algae are not currently monitored at GISP2. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.

Can dogs swim in GISP2?

No bloom is detected at GISP2 today, but dogs are much more vulnerable to blue-green algae than people, and blooms can form within hours. Always keep dogs away from water that looks green, scummy, or discolored, and rinse them off after swimming.

How many Louisiana lakes and beaches have swim advisories today?

Today, 69 Louisiana waters are under a swim advisory and 36 more warrant caution, out of 265 monitored waters SwimZone tracks in the state.

How is GISP2's water quality measured?

SwimZone builds this read from EPA CyAN satellite imagery for blue-green algae, official beach and fecal-bacteria advisories where a program monitors GISP2, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.