Yes they are allowed, read below for more information.
More information:
Entire park on provided roadways and below the high water line
Year-round
Eagle Point, Marquette, Bartlett Lane, Sheep Mountain, Stagecoach are all day use areas around the park
See park Map (above)
Year-round for all except Sheep Mountain Area.
Entire park has restrooms - 18 total
All park sites have one or more restrooms
Year-round except the North Fork Campground and the Sheep Mountain Area closed in the winter.
North Fork Campgound and Sheep Mountain Area
See above
May - Sept
River access for fishing for both the North Fork River and the South Fork River on the park
North Fork Campground, Sheep Mountain Area, and south end of the park for the South Fork River.
Year-round