BOISE COUNTY -- Mores Creek in Boise County is running at a record high level, with the water expected to rise with rain forecasted Tuesday.

By Tuesday morning, the creek was recorded at 3,460 cubic feet per second, almost seven times higher than the average for this time of year. The swift-moving water smashes the previous record for March 21: 1,830 cubic feet per second, set in 1972.

Officials warned motorists Monday to be careful if they are driving on Highway 21 near Idaho City.Runoff and flooding in the area has left water on the road in several places south of Idaho City.

Boise County Sheriff Jim Kaczmarek said the road is still passable for now, despite the flooding.

"Mores Creek is very high, its at the level of the highway," he said.

Standing water was several inches deep in several places on the highway, prompting the Idaho Department of Transportation to block lanes and direct traffic through with flaggers.

The water also swept away an old miners bridge that stretched over Mores Creek. The bridge has not been in use for some time, Kaczmarek said.

In Garden Valley, the rising Middle Fork forced out eight homeowners living on Thunderbolt Road along Lightning Creek. No evacuation orders are in effect, but Thunderbolt Road - a private drive - is no longer passable, according to the sheriff's office. Livestock had to be moved out by boat in the Anderson Creek area, but water is expected to recede there by later Tuesday.