All boats must be off the water on the Colorado side by that time. Otherwise, boaters will have to take their crafts out of the water at the marina on the south end of the reservoir in New Mexico.
Navajo State Park managers are taking advantage of the low water conditions to resurface about 200 feet of the ramp at the low end.
The section is deteriorating and makes it difficult to trailer boats in and out of the reservoir. Work on the ramp will start Oct. 15 and is expected to last several weeks.
Campgrounds and cabins at the park remain open.