Home > Missions > Navigation > Surveys > Dredge

Navigation Links

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.

The Dredging Reference Plan (DRP) is intended to be used as a temporary replacement to the District's Low Water Reference Plan (LWRP) during the current extreme low water event. The DRP is based on an analysis of recent low water channel performance and is intended to provide a more accurate and consistent profile between the gages on the Middle Mississippi, using St. Louis as the main reference. The DRP is temporarily replacing the LWRP due to changes in the channel since the LWRP's last full re-calculation and acceptance. The plane was developed between each automated gage site based on recent low-water readings and shifted down to be defined as the plane correlating with a St Louis gage reading of -7.

- MRM 19.5-21.5 (LWRP14): January 22, 2018
- MRM 38.3-39.7 (LWRP14): June 23, 2018 
- MRM 46.4-47.6 (LWRP14): February 06, 2018  
- MRM 47.7-48.3 SEMO (LWRP14): June 23, 2018 
- MRM 65.9-66.5 (LWRP14): January 25, 2018 
- MRM 95.4-96.7 (LWRP14): January 26, 2018
- MRM 98.5-100.5 (LWRP14): February 13, 2018
- MRM 170.4-172.1 (LWRP14): January 29, 2018
- MRM 200.0-200.7 (LWRP14): January 22, 2018
- MRM 200.0-200.7 (LWRP14): January 26, 2018
- MRM 202.5-203.3 (MP): February 27, 2018
- MRM 202.8-204.5 (MP): May 17, 2018 
- MRM 203.0-204.5 (MP): February 21, 2018
- MRM 205.5-206.1 (MP): July 03, 2018 NEW
- MRM 218.0-219.5 (MP): May 31, 2018 
- MRM 220.5-222.0 (MP): May 31, 2018 
- MRM 220.5-222.0 (MP): June 12, 2018 
- MRM 220.5-222.0 (MP): July 12, 2018 NEW
- MRM 220.0-222.0 (MP): June 25, 2018 
- MRM 226.3-227.5 (MP): June 11, 2018 
- MRM 226.5-227.5 (MP): July 12, 2018 NEW
- MRM 229.0-230.0 (MP): June 11, 2018 
- MRM 233.6-235.1 (MP): June 11, 2018 
- MRM 241.5-244.0 (MP): February 22, 2018
- MRM 241.5-273.2 (MP): July 18, 2018 NEW
- MRM 254.0-256.0 (MP): July 13, 2018 NEW
- MRM 273.5-275.0 (MP): February 23, 2018  
- MRM 273.8-273.5 (MP): June 04, 2018
- IRM 44.3-45.8 (MP): January 23, 2018                           
- KRM 0.0-0.8 (LWRP14) July 17, 2018 NEW