Beach · Aransas County · TX
Is Highway 188 @ Port Bay South safe to swim?
Recent heavy rain may have spiked bacteria since the last clear sample.
Updated July 19, 2026 · Texas beach program (EPA BEACON)
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Know before you get in at Highway 188 @ Port Bay South.
Get an alert the day a bacteria or algae advisory goes up.
What's in the water at Highway 188 @ Port Bay South right now
As of July 19, 2026, Highway 188 @ Port Bay South in Aransas County, Texas 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 3.4 in, which can wash bacteria and nutrients into the water.
Blue-green algae at Highway 188 @ Port Bay South
Highway 188 @ Port Bay South is a lake in Aransas County, Texas. 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.
Frequently asked: swimming in Highway 188 @ Port Bay South
- Is it safe to swim in Highway 188 @ Port Bay South right now?
- Highway 188 @ Port Bay South 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 Highway 188 @ Port Bay South have blue-green algae (cyanobacteria)?
- Blue-green algae are not currently monitored at Highway 188 @ Port Bay South. Watch for green, blue-green, or paint-like scum and avoid the water if you see it.
- Can dogs swim in Highway 188 @ Port Bay South?
- No bloom is detected at Highway 188 @ Port Bay South 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 Texas lakes and beaches have swim advisories today?
- Today, 78 Texas waters are under a swim advisory and 86 more warrant caution, out of 399 monitored waters SwimZone tracks in the state.
- How is Highway 188 @ Port Bay South'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 Highway 188 @ Port Bay South, and a recent-rainfall overlay, all refreshed daily. It was last updated July 19, 2026.