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Dredge Surveys


A detailed survey of a specific area (usually a 1 to 2 mile section) of the river. Dredge surveys can be split into two groups: pre-dredge surveys and post-dredge surveys. Pre-dredge surveys are analyzed to determine if dredging is required in a potentially problematic location. If dredging is required, these surveys are then used to layout the dredge cuts and to estimate the volume of material that will need to be moved. A post-dredge survey is completed after dredging has been completed in a specific location to ensure that the problematic area has been removed.

Survey depths are shown below a reference plane representing a low flow condition.  St. Louis District has two types of river systems, a pooled river created by the Lock and Dam system, and an open free flowing river without Locks and Dams.  In a pooled river system, the low flow condition is determined from the minimum water surface provided by the Lock and Dam system; this water surface is known as minimum pool.  In an open or free flowing river, such as the Mississippi River downstream of Locks 27, the low flow condition is called the Low Water Reference Plane (LWRP). The low flow condition the LWRP represents is the calculated water surface profile resulting from the 97% exceedance discharge based on a set period of record. This reference plane allows for common comparison between different points on the river. 

The most recent surveys are linked below.  Older surveys can be found by going to the USACE e-hydro website, where all available surveys are posted.

E-Hydro Link

- MRM 0.9 - 1.6 (LWRP14): August 31, 2022 
- MRM 0.9 - 1.8 (LWRP14): September 28, 2022 
- MRM 1.0 - 1.7 (LWRP14): July 25, 2022 
- MRM 9.2 - 10.3 (LWRP14): August 31, 2022 
- MRM 15.0-16.0 (LWRP14): October 04, 2022 
- MRM 15.0-16.2 (LWRP14): August 16, 2022 
- MRM 15.2-16.2 (LWRP14): August 31, 2022 
- MRM 15.3-16.2 (LWRP14): July 25, 2022 
- MRM 17.0-19.0 (LWRP14): August 31, 2022 
- MRM 23.2-24.7 (LWRP14): November 09, 2022 NEW
- MRM 23.2-24.7 (LWRP14): September 02, 2022  
- MRM 23.8-24.7 (LWRP14): October 04, 2022 
- MRM 27.0-29.0 (LWRP14): September 02, 2022  
- MRM 27.3-28.2 (LWRP14): October 04, 2022 
- MRM 28.0-29.0 (LWRP14): October 12, 2022 
- MRM 34.5-37.0 (LWRP14): October 12, 2022 
- MRM 37.0-38.5 (LWRP14): November 08, 2022 NEW
- MRM 37.0-39.0 (LWRP14): September 03, 2022  
- MRM 38.2-38.8 (LWRP14): November 25, 2022 NEW
- MRM 39.6-40.0 (LWRP14): September 02, 2022  
- MRM 41.3-43.0 (LWRP14): September 03, 2022  
- MRM 42.6-44.4 (LWRP14): September 15, 2022 
- MRM 44.0-45.1 (LWRP14): September 04, 2022  
- MRM 45.3-48.2 (LWRP14): October 05, 2022 
- MRM 45.6-47.0 (LWRP14): December 13, 2021 
- MRM 46.0-47.0 (LWPR14): January 12, 2022 
- MRM 47.8-48.1 SEMO (LWRP14): September 22, 2022 
- MRM 47.8-48.2 SEMO (LWRP14): July, 14 2022 
- MRM 54.0-55.1 (LWRP14): September 06,2022 
- MRM 54.1-54.9 (LWRP14): December 13, 2021 
- MRM 58.0-58.8 (LWRP14): September 06,2022 
- MRM 58.0-59.0 (LWRP14): July 26, 2022 
- MRM 63.0-64.2 (LWRP14): October 06, 2022 
- MRM 65.7-66.3 (LWRP14): October 06, 2022 
- MRM 68.8-69.2 (LWRP14): October 06, 2022 
- MRM 68.8-70.0 (LWRP14): September 06,2022 
- MRM 69.0-69.9 (LWRP14): November 16, 2022 NEW
- MRM 72.7-73.4 (LWRP14): September 07,2022 
- MRM 74.8-75.4 (LWRP14): November 17,2022 NEW
- MRM 74.8-75.4 (LWRP14): October 07, 2022 
- MRM 74.9-75.7 (LWRP14): September 07,2022 
- MRM 80.0-80.4 (LWRP14): November 12, 2022 NEW
- MRM 90.3-91.0 (LWRP14): September 28, 2022 
- MRM 93.8-95.5 (LWRP14): October 01, 2022 
- MRM 97.3-97.8 (LWRP14): September 28, 2022 
- MRM 97.3-99.0 (LWRP14): October 01, 2022 
- MRM 100.5-103.5 (LWRP14): September 30, 2022 
- MRM 101.5-103.5 (LWRP14): November 23, 2022 NEW
- MRM 102.2-103.2 (LWRP14): August 04, 2022 
- MRM 102.2-103.4 (LWRP14): July 22, 2022 
- MRM 102.5-103.2 (LWRP14): August 30, 2022 
- MRM 106.8-109.0 (LWRP14): September 30,2022 
- MRM 110.0-110.8 (LWRP14): December 14, 2021 
- MRM 110.0-111.0 (LWRP14): October 11, 2022 
- MRM 110.2-111.0 (LWRP14): November 23, 2022 NEW
- MRM 112.6-113.5 (LWRP14): October 11, 2022 
- MRM 113.0-113.6 (LWRP14): November 23, 2022 NEW
- MRM 115.0-115.7 (LWRP14): September 19, 2022 
- MRM 115.0-115.7 (LWRP14): August 04, 2022 
- MRM 115.0-115.8 (LWRP14): July 22, 2022 
- MRM 122.0-122.8 (LWRP14): October 07, 2022 
- MRM 122.1-122.7 (LWRP14): August 08, 2022 
- MRM 125.0-126.0 (LWRP14): October 15, 2022 
- MRM 125.0-126.0 (LWRP14): October 03, 2022 
- MRM 125.2-128.9 (LWRP14): September 08, 2022 
- MRM 128.0-128.8 (LWRP14): July 26, 2022 
- MRM 128.0-129.0 (LWRP14): September 26, 2022 
- MRM 128.9-130.0 (LWRP14): September 08, 2022 
- MRM 129.0-130.0 (LWRP14): October 03, 2022 
- MRM 131.4-132.5 (LWRP14): September 26, 2022 
- MRM 131.5-132.4 (LWRP14): September 01, 2022 
- MRM 136.4-137.3 (LWRP14): September 01, 2022 
- MRM 138.5-139.2 (LWRP14): September 01, 2022 
- MRM 145.0-146.0 (LWRP14): September 01, 2022 
- MRM 147.0-150.0 (LWRP14): September 26, 2022 
- MRM 151.8-153.0 (LWRP14):  September 27, 2022 
- MRM 153.8-155.0 (LWRP14): September 22, 2022 
- MRM 153.8-155.0 (LWRP14): September 28, 2022  
- MRM 156.0-156.5 (LWRP14): September 22, 2022
- MRM 158.5-159.1 (LWRP14): September 12, 2022 
- MRM 159.5-160.7 (LWRP14): September 20, 2022 
- MRM 160.0-160.7 (LWRP14): August 17, 2022 
- MRM 160.1-160.7 (LWRP14): July 21, 2022 
- MRM 165.8-169.8 (LWRP14): November 28, 2022 NEW
- MRM 166.1-167.1 (LWRP14): August 05, 2022 
- MRM 166.3-167.1 (LWRP14): September 26, 2022 
- MRM 166.5-167.1 (LWRP14): July 21, 2022 
- MRM 167.4-168.8 (LWRP14): December 06, 2021 
- MRM 167.4-169.0 (LWRP14): July 21, 2022 
- MRM 167.5-169.2 (LWRP14): September 27, 2022 
- MRM 167.8-168.5 (LWRP14): October 21, 2022 
- MRM 169.0-172.0 (LWRP14): October 05, 2022 
- MRM 170.4-172.1 (LWRP14):  July 20, 2022 
- MRM 170.7-172.2 (LWRP14): December 06, 2021 
- MRM 172.7-173.6 (LWRP14): January 10, 2022 
- MRM 172.7-173.6 (LWRP14): December 06, 2021 
- MRM 172.8-173.2 (LWRP14): October 05, 2022 
- MRM 172.8-173.5 (LWRP14): October 24, 2022 
- MRM 172.8-173.6 (LWRP14): July 20, 2022 
- MRM 174.5-175.1 (LWRP14): September 12, 2022 
- MRM 174.5-175.5 (LWRP14): January 10, 2022 
- MRM 174.5-176.0 (LWRP14): November 22, 2022 NEW
- MRM 174.6-175.0 (LWRP14): October 05, 2022 
- MRM 176.2-177.1 (LWRP14): January 19, 2022 
- MRM 176.4-177.2 (LWRP14): September 22, 2022 
- MRM 176.4-177.2 (LWRP14): December 08, 2021 
- MRM 176.4-177.5 (LWRP14): October 04, 2021 
- MRM 180.8-1821.0 (LWRP14): November 22, 2022 NEW
- MRM 181.0-181.5 (LWRP14): December 06, 2021 
- MRM 182.3-183.0 (LWRP14): December 06, 2021 
- MRM 182.3-183.2 (LWRP14): August 29, 2022 
- MRM 183.5-185.5 (LWRP14): September 20, 2022 
- MRM 183.5-185.5 (LWRP14): July 07, 2022 
- MRM 183.8-185.5 (LWRP14): November 22, 2022 NEW
- MRM 191.0-192.0 (LWRP14): June 29, 2022 
- MRM 193.5-194.2 (LWRP14): August 29, 2022 
- MRM 193.5-194.2 (LWRP14): December 06, 2021 
- MRM 193.7-194.2 (LWRP14): June 29, 2022 
- MRM 195.4-196.2 (LWRP14): June 29, 2022 
- MRM 200.1-200.7 (LWRP14): November 17, 2021
- MRM 200.1-200.7 (LWRP14): November 04, 2022 NEW
- MRM 202.6-203.9 (MP): May 27, 2022 
- MRM 207.0-208.0 (MP): May 27, 2022 
- MRM 207.2-208.0 (MP): June 22, 2022 
- MRM 217.2-218.3 (MP): June 23, 2022 
- MRM 217.2-218.3 (MP): May 26, 2022 
- MRM 218.4-219.8 (MP): July 1, 2022 
- MRM 220.4-223.8 (MP): July 1, 2022
- MRM 224.2-225.0 (MP): July 1, 2022 
- MRM 240.8-241.5 (MP): August 25, 2022 
- MRM 240.9-241.5 (MP): November 14,  2022 NEW
- MRM 240.9-241.5 (MP): October 12,2022 NEW
- MRM 241.5-241.5 (MP): July 6, 2022
- MRM 240.8-243.3 (MP): October 22, 2021 
- MRM 241.5-243.3 (MP): November 16, 2021 
- MRM 247.5-248.1 (MP): July 28, 2022 
- MRM 248.7-249.5 (MP): August 26, 2022 NEW
- MRM 248.7-249.5 (MP): July 28, 2022 
- MRM 252.4-253.7 (MP): July 14, 2022 
- MRM 254.4-256.3 (MP): August 25, 2022 NEW
- MRM 254.4-256.3 (MP): July 14, 2022 
- MRM 254.5-256.3 (MP): July 25, 2022 
- MRM 261.7-262.3 (MP): July 14, 2022 
- MRM 265.7-267.4 (MP): August 30, 2022 NEW
- MRM 265.7-267.7 (MP): July 14, 2022 
- MRM 268.7-269.3 (MP): July 14, 2022 
- MRM 272.6-273.0 (MP): August 31, 2022 NEW
- MRM 272.6-273.0 (MP): July 14, 2022 
 
- MRM 273.5-275.0 (MP): August 31, 2022 
- MRM 273.7-275.0 (MP): May 27, 2022
- MRM 288.8-289.9 (MP): November 16, 2021
- MRM 288.9-289.9 (MP): October 26, 2021 
- MRM 288.8-290.0 (MP): October 11, 2021 
- MRM 288.9-290.0 (MP): March 08, 2022 
- MRM 289.0-289.5 (MP): April 01, 2022
- MRM 289.0-289.6 (MP): October 21, 2022 NEW
- MRM 289.0-289.6 (MP): October 06, 2022 NEW
- MRM 289.0-289.6 (MP): August 31, 2022 
- MRM 289.0-290.0 (MP): July 07, 2022 
- MRM 293.4-294.3 (MP): July 07,2022 
- IRM 27.9-28.5 (MP): July 07, 2022 
- IRM 35.0-37.2 (MP): July 07, 2022 
- IRM 58.5-59.1 (MP): July 07, 2022 
- IRM 61.4-63.2 (MP): September 20, 2021 
- IRM 62.2-63.7 (MP): July 28, 2022 
- IRM 62.7-63.7 (MP): October 06, 2021 
- IRM 62.8-63.7 (MP): November 18, 2021            
- IRM 65.4-67.0 (MP): November 09, 2022 NEW
- IRM 65.5-67.0 (MP): August 20, 2022 
- IRM 73.0-73.6 (MP): July 19, 2022 
- IRM 73.0-76.0 (MP): June 22, 2022 
- IRM 74.0-78.9 (MP): October 11, 2022 
- IRM 74.0-78.9 (MP): August 02, 2022 
- IRM 74.5-79.0 (MP): August 22. 2022 
- KRM 0.0-0.8 (LWRP14): October 01, 2022 NEW
- KRM 0.0-0.8 (LWRP14): June 30, 2022