Rock Island District Locations

The Rock Island District of the U.S. Army Corps of Engineers administers federal water resource programs in a 78,000 square-mile area encompassing the eastern two-thirds of Iowa, the northern half of Illinois and portions of southern Wisconsin and Minnesota, and the northeast corner of Missouri. This area includes 314 miles of the Mississippi River, 269 miles of the Illinois Waterway and their tributaries, and 197,000 acres of federal land.

For more information on Corps lands in your area visit:

Contact Information

Mailing Address for Regular Mail:

U.S. Army Corps of Engineers, Rock Island
Clock Tower Building
P.O. Box 2004
Rock Island, IL  61204-2004

Mailing Address for Deliveries (FedEx or USPS):

U.S. Army Corps of Engineers, Rock Island
Clock Tower Building
1500 Rock Island Drive
Rock Island, IL  61201

Phone: (309) 794-4200
Toll-free: (800) 799-8302

Fax: (309) 794-5793

More Contact Information

Visiting the Rock Island District Office

The Rock Island District Headquarters is located in the Clock Tower Building on the west end of the Rock Island Arsenal which sits on an island in the middle of the Mississippi River. It is important to remember that the Mississippi River flows east to west at this location rather than north to south. This change in river flow can set you off course when navigating around the Quad Cities.

If using a GPS to find the Rock Island District, use this address: 1500 Rock Island Drive, Rock Island, IL. Link to Google Maps.

Click here for a map of Rock Island Arsenal.


The Rock Island District Headquarters Office (Clock Tower Building), Mississippi River Visitor Center and Locks and Dam 15 are located on the west end of Arsenal Island in Rock Island, Illinois. Visitors must access the Island using the Moline Gate located near River Drive and 16th St. in Moline, Illinois.

These facilities are located on a military installation which requires visitors to be processed through a security checkpoint upon entering the island. Each person over the age of 16 will be required to show identification and a background check will be completed before an access pass will be issued.

Visit the Rock Island Arsenal's Visitor Access Website for more details.


Rock Island Arsenal Gate Hours

Moline Gate: Open 7 days a week, 24 hours a day

Davenport Gate: Monday - Friday: 2 p.m.. - 5:30 p.m. with outbound traffic only.

Rock Island Gate: Monday - Friday: 5:30 a.m. - 10:30 p.m. with outbound traffic only from 10:30 p.m. - midnight, Saturday & Sunday: 8 a.m. - 9 p.m.