Current Weather Conditions
John A. Weeks III
Monday, July 22, 2024, 8:27:55 PM CDT
Home Photo Tours Rail Fan 12 Easy Steps
Aviation Spacecraft Highways & Bridges About The Author
Google Search
Maps   Groups   Images   Search
  • 12 Easy Steps
  • Aviation
  • Spacecraft
  • Highways & Bridges
    » Bridge Photography
      - MSP River Bridges
      - C & D Canal
      - Illinois River
      - Minnehaha Creek
      - Minnesota River
      - Mississippi River
        › Lake Itasca Area
        › Bemidji Area
        › Cass Lake - Ball Club
        › Grand Rapids Area
        › Blackberry - Crosby
        › Brainerd Lakes Area
        › Little Falls Area
        › St. Cloud Area
        › North Metro Area
        › Port Of Minneapolis
        › St. Anthony Falls Area
        › Mississippi Rvr Gorge
        › St. Paul Area
        › S St. Paul - Hastings
        › Red Wing - Winona
        › La Crosse Area
        › Lansing - Clinton
        › Quad Cities Area
        › Muscatine - Louisiana
        › St. Louis Area
          · Clark Superbridge
          · Melvin Price L&D
          · Chain Of Rocks Canal
          · New Chain Of Rocks
          · Double Chain Bridge
          · Chain Of Rocks Br
          · Single Chain Bridge
          · Water Intake Houses
          · Dam #27
          · Lock #27
          · Merchants Bridge
          · McKinley Bridge
          · McKinley Br (EB)
          · McKinley Br (WB)
          · Ronald W Reagan Br
          · Martin Luther King
          · Eads Bridge
          · Poplar Street Br
          · Gen D MacArthur Br
          · Jefferson Barracks Br
        › Chester - Cairo
        › Miss - Tenn - Ark
        › Ark - Miss - Louisiana
        › Louisiana Structures
      - Missouri River
      - St. Croix River
      - St. Louis River
      - Wisconsin River
      - Best Miss River Photos
      - Cable Stayed Bridges
      - McGilvray Road Bridges
      - I-35W Bridge Disaster
      - Miscellaneous Bridges
      - Madison County Bridges
      - Hist Br Weekend 2013
    » Road Geek Topics
  • Photo Tours
  • Rail Fan
  • About The Author
Site Search By JRank
Highways, Byways, And Bridge Photography
Chain Of Rocks Canal
Mississippi River Canal At Saint Louis
Granite City, Illinois

Chain Of Rocks Canal

• Structure: Chain Of Rocks Canal.
• Location: River Miles 184.1 to 194.2.
• Canal Length: 8.4 Miles.
• River Elevation: 400 Feet.
• Date Opened: February 7, 1953.
By 1940, the locks and dams from Minneapolis down to Alton, Illinois, were in place and operational. The only challenge to navigation left on the upper Mississippi River was a series of rock ledges and shelves that extended for 17 miles on the north-east side of Saint Louis. Navigation through this area was impossible during lower water, and dangerous during high water.

To solve this problem, the US Army Corps of Engineers designed and built the Chain Of Rocks Canal to bypass this area. The canal ran from just south of the mouth of the Missouri River to just north of downtown Saint Louis. The canal cut across highway US-66, so a bridge had to be built over the canal. Later, when I-270 was constructed, a pair of big metal monster bridges were built just north of US-66.

Due to bedrock being so close to the surface, the canal could only be so deep. Since cutting through the rock would be dramatically more expensive, an alternate solution of providing a deeper channel was accomplished by building a dam across the Mississippi River just south of the entrance to the canal. This caused water to back up behind the dam, raising the level of the river by 3 feet, giving the canal an extra 3 feet of water depth. The dam across the Mississippi River did not need to provide for navigation. So rather than building an elaborate lock and dam structure, the US Army Corps Of Engineers simply dumped barge load after barge load of rock in the river. The water raises up behind the rocks, and then flows over the rocks.

Locks #27 are located at the south end of the canal. While the canal water level remains level at 400 feet above sea level, the Mississippi River drops nearly 15 feet in the 10 miles that are bypassed by the canal. As a result, a lock is required to maintain that difference in water levels.

The photo above is looking north, with a view of both the single and double chain bridges. The first photo below is taken at the same location looking south. The canal was built very straight and level. The bottom photo is the northern entrance to the canal. The canal is in the foreground, while the combined Mississippi River and Missouri River is in the background.

Chain Of Rocks Canal
Chain Of Rocks Canal

Made With Macintosh
Authored by John A. Weeks III, Copyright © 1996—2016, all rights reserved.
For further information, contact: