It's only a couple of feet below what the Army Corps of Engineers considers a 100-year flood.
There is concern that more rain could flood some homes, and there's also concern about Lake Ray Roberts.
The Army Corps of Engineers, which manages the lakes, said Friday that this is considered unprecedented flooding.
Denton Emergency Services says it's seen about 40 road closures in Denton County.
Approximately 16 homes are surrounded by water, and more storms will make it even worse.
Diane Brandenburger lost her backyard to rising flood waters of Lewisville Lake.
Moving her daughter's horses to high ground was step one. Residents like her are now being warned to keep a close eye on lake levels.
"It just keeps coming up a little bit more all the time," said Brandenburger. "After it rained last night, it came up a lot."
The Army Corps of Engineers is in flood operations with all of its eight Upper Trinity Water Basin lakes.
It's letting water out of the Lewisville Lake floodgate. The lake is already going over the spillway for the first time since 2007, and the Corps is also releasing water from Lake Ray Roberts floodgate.
If water flows over the spillway there, it would mark the first time since it was built 28 years ago.
"If a large event occurs, we could actually have water flowing over that spillway and we just wanna caution everybody, additionally the lake itself has expanded greatly in size," said Jerry Cotter with the Army Corps of Engineers. "It's added 10,000 acres."
Denton Emergency Services is urging residents to take caution if they're on the lakes and for residents in a flood zone to sign up for the city's early notification Code Red program.
"We're concerned about water flowing over the roads and there are some homes that could be at risk," said Marc Dodd with Denton County Emergency Services.