The National Park Service plans to close part of Beach Drive between rush hours Thursday and Friday so that maintenance workers can begin to repair and clean the Zoo Tunnel, near the National Zoo.

Beach Drive will be closed to traffic between Rock Creek Parkway, just west of Connecticut Avenue NW, and Klingle Road NW from 9:30 a.m. until 2:30 p.m. both days.

It’s a full closing to create a safe work zone and to accommodate the equipment for the repair work, the park service said.

This is one of two park service projects affecting traffic in the area this week. The other is a little farther south on the parkway, and I think it’s the one a traveler was asking about during my online chat today.

Starting today, the park service said, drivers will find the southbound curb lane of Rock Creek Parkway closed approaching Waterside Drive. The Federal Highway Administration is going to lengthen the acceleration lane from Waterside Drive onto the parkway in a project scheduled to end in November.

A new traffic pattern for morning rush hour will allow use of only the northbound travel lanes to Waterside Drive.

Between 7 and 9:15 a.m. Mondays through Fridays, the National Park Service says, traffic will be able to enter the Shoreham Drive/Calvert Street ramp adjacent to the Shoreham Hotel from southbound Connecticut Avenue at Calvert Street, and proceed to the southbound parkway.

At other times, the Shoreham Drive/Calvert Street ramp will be closed to southbound traffic.

Beginning at 9:30 a.m., the traffic direction will be reversed, so drivers can go north only on the Shoreham Drive/Calvert Street ramp.