Lock and Dam #25
Highway N
Winfield, Missouri
636-566-8120

Lock and Dam No. 25 is located near Winfield, Missouri on the Upper Mississippi River at river mile 241.4. Listed on the National Register of Historic Places construction of the lock and dam began in 1935 and became operational in May 1939. The dam portion of the structure is 1,140 feet long with 14 60-foot tainter gates and 3 100-foot roller gates. A 2,566 foot submersible dike extends to the Illinois shore. A 5 mile long dike is part of the facility extending upstream on the Missouri side of the river. The pool created by the structure is 32 miles long and covers 18,000 acres. The main lock is 110 feet wide by 600 feet long with an average lift of 15 feet.

The Sandy Island Bald Eagle Sanctuary is just downstream from Lock and Dam #25 and bald eagles can be seen during the winter as the birds take advantage of the open churning water created by the lock and dam. The preserve is closed to all visitation from November 1 to March 1.

The Winfield Ferry that connects Lincoln County, MO to Calhoun County, IL runs just south of Lock and Dam #25. Recreational facilities include riverside picnic tables with barbeque pits and restrooms. Fishing is allowed on the banks of Sandy Slough.

Visiting Lock and Dam #25
Visiting Hours:
          Open daily from 6 am to sunset.
There is no charge to visit Lock and Dam #25.

Directions: To reach Lock and Dam #25 take MO-79 north of the St. Louis metropolitan area to Highway N at Winfield. Take Highway N about 1 mile east of Winfield to the lock and dam.

Regional Locks and Dams - Get more information on the Locks and Dams in the Middle Mississippi River Valley from Lock and Dam #21 north of Hannibal to Lock #27 and the Chain of Rocks Dam in Granite City, Illinois.