What to expect on Boise River float’s final weekend: heat — and E. coli?
The Boise River float season comes to a close on Labor Day weekend, and recreationists will experience hot weather and a good river flow.
But floaters also need to be aware of concerning E. coli levels in the water.
Monday, Sept. 1, is the last official day for float service on the river, including rentable rafts, tubes and paddles at Barber Park, as well as shuttle services. If you float after the season ends, and need a river rescue of any sort, you can be held responsible for payment.
This float season, about 150,000 people have journeyed down the river between Barber and Ann Morrison parks, according to Boise Parks and Recreation. Thousands of people are expected to hit the river this weekend, too, enjoying sunshine and temperatures in the 90s, and a flow of 750 cubic feet per second.
However, E. coli levels sitting at around 325 units per 100 milliliters were detected during Monday testing, Boise’s Parks and Rec website showed. According to the department, when the level reaches about 235 units, it’s concerning.
“Concentrations of E. coli above 235 E. coli units/100 mL can pose health risks to swimmers,” the website posting said.
There has not been a health advisory issued by the Department of Health and Welfare for the river, though.
When E. coli levels are high in a body of water, experts recommend keeping your hands as clean as possible and showering after exposure to the water. People also should avoid feeding geese or ducks, and keep their pets out of the water, as animals tend to ingest it and have a higher risk of getting ill.
This story was originally published August 29, 2025 at 3:30 PM.
