Notes: Constitution Ave. & 15th St. NW
Telephone: 202.426.6841
Admission: Free
Monument Hours: September through March daily 9:00 AM - 5:00 PM

The Washington Monument is administered by the National Park Service, U.S. Department of the Interior. It is open 7 days a week, 9 a.m. to 5 p.m. Extended summer hours are 8 a.m. to midnight. The monument is closed on December 25. Address all inquiries to the Mall Operations Office, 1100 Ohio Drive SW, Washington D.C. 20242.

Total cost: $1,187,710

Height of monument above floor: 555 feet 5 1/8 inches

Width at base of shaft: 55 feet 1 1/2 inches

Width at top of shaft: 34 feet 5 1/2 inches

Thickness of walls at base of shaft: 15 feet

Thickness of walls at top of shaft: 18 inches

Depth of foundation: 36 feet 10 inches

Weight of monument: 90,854 tons

Sway of monument in 30-mile-per-hour wind: 0.125 of an inch

Tourmobile Service
The National Park Service has concessioner-operated guided tourmobiles with unlimited reboarding privileges. Call 554-5100 for rate information.

The Mall and West Potomac Park. Tourmobiles stop at 11 points to discharge and pick up passengers from 9 a.m. to 7 p.m., June through Labor Day; and from 9:30 a.m. to 4:30 p.m., the rest of the year.

Arlington National Cemetery. Tourmobiles stop at Arlington House, President Kennedy's Gravesite, Tomb of the Unknowns, and the visitor center from 8 a.m. to 7 p.m., April to October; and from 8 a.m. to 5 p.m., November to March.