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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 1.0 - 1.7 (LWRP14): July 25, 2022 
- MRM 14.7-16.2 (LWRP14): September 27, 2021 
- MRM 15.2-16.1 (LWRP14): September 02, 2021 
- MRM 15.3-16.2 (LWRP14): July 25, 2022 
- MRM 23.5-24.7 (LWRP14): September 30, 2021 
- MRM 23.8-25.0 (LWRP14): August 26, 2021 
- MRM 23.8-25.0 (LWRP14): July 30, 2021 
- MRM 24.0-24.7 (LWRP14): September 09, 2021 
- MRM 27.5-29.0 (LWRP14): August 26, 2021 
- MRM 34.8-36.3 (LWPR14): September 06, 2021 
- MRM 36.8-37.8 (LWRP14): September 06, 2021 
- MRM 40.8-42.2 (LWRP14): September 07, 2021 
- MRM 45.2-47.0 (LWRP14): September 07, 2021 
- 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 28, 2021 
- MRM 47.8-48.1 SEMO (LWRP14): August 31, 2021 
- MRM 47.8-48.2 SEMO (LWRP14): July, 14 2022 
- MRM 54.1-54.9 (LWRP): December 13, 2021 
- MRM 55.7-56.4 (LWRP14): September 08, 2021 
- MRM 57.8-58.8 (LWRP14): September 08, 2021 
- MRM 58.0-59.0 (LWRP14): July 26, 2022 
- MRM 76.1-76.8 (LWRP14): September 13, 2021 
- MRM 79.7-80.7 (LWRP14): September 13, 2021 
- MRM 101.8-103.5 (LWRP14): August 25, 2021 
- MRM 102.0-103.5 (LWRP14): July 29, 2021
- MRM 102.1-103.2 (LWRP14): September 22, 2021 
- MRM 102.1-103.2 (LWRP14): September 12, 2021 
- MRM 102.2-103.2 (LWRP14): August 04, 2022 NEW
- MRM 102.2-103.4 (LWRP14): July 22, 2022 
- MRM 110.0-110.8 (LWRP14): December 14, 2021 
- MRM 114.3-115.8 (LWRP14): September 12, 2021 
- MRM 115.0-115.7 (LWRP14): August 04, 2022 NEW
- MRM 115.0-115.8 (LWRP14): July 22, 2022 
- MRM 125.0-126.9 (LWRP14): September 14, 2021 
- MRM 128.0-128.8 (LWRP14): July 26, 2022 
- MRM 160.1-160.7 (LWRP14): July 21, 2022 
- MRM 166.1-167.1 (LWRP14): August 05, 2022 NEW
- MRM 166.2-167.2 (LWRP14): September 23, 2021 
- 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 167.6-169.9 (LWRP14): July 28, 2021 
- MRM 170.4-172.0 (LWRP14): September 23, 2021 
- MRM 170.4-172.1 (LWRP14):  July 20, 2022 
- MRM 170.7-171.7 (LWRP14): July 28, 2021 
- 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 172.8-173.5 (LWRP14): July 28, 2021 
- MRM 172.8-173.6 (LWRP14): July 20, 2022 
- MRM 174.5-175.5 (LWRP14): January 10, 2022 
- MRM 176.2-177.1 (LWRP14): January 19, 2022 
- MRM 176.4-177.2 (LWRP14): December 08, 2021 
- MRM 176.4-177.5 (LWRP14): October 04, 2021 
- MRM 181.0-181.5 (LWRP14): December 06, 2021 
- MRM 182.3-183.0 (LWRP14): December 06, 2021 
- MRM 183.0-185.5 (LWRP14): August 12, 2021 
- MRM 183.5-185.5 (LWRP14): July 07, 2022 
- MRM 183.7-185.1 (LWRP14): September 29, 2021 
- MRM 191.0-192.0 (LWRP14): June 29, 2022 
- MRM 193.5-194.2 (LWRP14): December 06, 2021 
- MRM 193.5-194.2 (LWRP14): September 22, 2021 
- MRM 193.5-194.2 (LWRP14): August 09, 2021 
- MRM 193.7-194.2 (LWRP14): June 29, 2022 
- MRM 195.3-196.3 (LWRP14): August 09, 2021 
- MRM 195.4-196.2 (LWRP14): June 29, 2022 
- MRM 200.1-200.7 (LWRP14): November 17, 2021
- MRM 200.1-200.7 (LWRP14): August 10, 2021 
- 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 NEW
- MRM 220.4-223.8 (MP): July 1, 2022 NEW
- MRM 224.2-225.0 (MP): July 1, 2022 NEW
- MRM 234.0-235.2 (MP): July 28, 2021 
- MRM 241.5-241.5 (MP): July 6, 2022 NEW
- MRM 240.8-243.3 (MP): October 22, 2021 
- MRM 241.5-243.3 (MP): November 16, 2021 
- MRM 241.5-244.0 (MP): July 21, 2021 
- MRM 242.0-243.1 (MP): July 12, 2022 NEW
- MRM 247.5-248.1 (MP): July 28, 2022 NEW
- MRM 248.7-249.5 (MP): July 28, 2022 NEW
- MRM 248.8-249.6 (MP): August 11, 2021 
- MRM 252.4-253.7 (MP): July 14, 2022 NEW
- MRM 252.5-254.0 (MP): August 11, 2021 
- MRM 254.4-256.3 (MP): July 14, 2022 NEW
- MRM 254.5-256.3 (MP): July 25, 2022 NEW
- MRM 261.7-262.3 (MP): July 14, 2022 NEW
- MRM 265.3-266.8 (MP): July 31, 2021 
- MRM 265.7-267.7 (MP): July 14, 2022 NEW
- MRM 268.5-270.1 (MP): August 12, 2021 
- MRM 268.7-269.3 (MP): July 14, 2022 NEW
- MRM 269.8-271.0 (MP): July 31, 2021 
- MRM 272.6-273.0 (MP): July 14, 2022 NEW
 
- 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 288.8-290.0 (MP): August 17, 2021 
- MRM 288.8-290.0 (MP): July 28, 2021 
- MRM 288.9-290.0 (MP): March 08, 2022 
- MRM 289.0-289.5 (MP): April 01, 2022
- MRM 289.0-290.0 (MP): July 26, 2022 NEW
- MRM 289.0-290.0 (MP): July 07,2022 NEW
- MRM 293.4-294.3 (MP): July 07,2022 NEW
- IRM 27.9-28.5 (MP): July 07, 2022 
- IRM 35.0-37.2 (MP): July 07, 2022 
- IRM 36.0-37.2 (MP): July 29, 2021 
- IRM 39.8-41.5 (MP): July 29, 2021 
- IRM 43.0-45.0 (MP): July 30, 2021 
- IRM 47.0-47.8 (MP): July 30, 2021 
- IRM 58.5-59.1 (MP): July 07, 2022 
- IRM 58.5-59.2 (MP): August 01, 2021 
- IRM 61.4-63.2 (MP): September 20, 2021 
- IRM 61.4-63.7 (MP): August 01, 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 73.0-73.6 (MP): July 19, 2022 
- IRM 73.0-76.0 (MP): June 22, 2022 
- IRM 74.0-78.9 (MP): August 02, 2022 NEW
- IRM 74.4-78.8 (MP): July 30, 2021 
- IRM 75.0-80.0 (MP): June 14, 2021 
- IRM 75.5-78.9 (MP): September 17, 2021 
- KRM 0.0-0.8 (LWRP14): June 30, 2022 NEW
- KRM 0.0-0.8 (LWRP14): October 17, 2021