The Withlacoochee River has been at a minor flood stage in southeastern Hernando County since Sunday night, according to the National Weather Service.
It is expected to remain at that stage until about 8 p.m. Thursday.
A couple of road barricades were set up Tuesday in Talisman Estates due to some road flooding, authorities said. In neighboring Riverdale, the neighborhood park along the river also was flooded.
As of Tuesday, no homes had been affected by the rising river, said Cecilia Patella, a spokeswoman with Hernando County Emergency Management.
The National Weather Service issued its flood warning Sunday afternoon for residents in the Trilby area.
Tropical Storm Isaac brought more rainfall to the Green Swamp Wilderness Preserve, which supplies water to the river.
The flood stage for that area is 12 feet. As of Tuesday afternoon, the river was at 12.23 feet.
Other areas affected by the rising river at Trilby include Lacoochee, River Height Estates and Nobleton.
Patella said the river is not expected to go much higher unless there is another major rain event.
There is a 46-percent chance of an afternoon shower Wednesday and 41-percent chance of rain Thursday, but no major storms are included in the forecast, according to AccuWeather.com.