DN 20-08 DREDGING NOTICE
U.S. ARMY CORPS OF ENGINEERS
ST. PAUL DISTRICT
NOTICE DATE: May 4th, 2020 DREDGING CATEGORY: Imminent MEETING DATE: If requested MEETING TIME:
BOAT REQUIREMENT: MEETING LOCATION:
DREDGE CUT NAME: Head of Raft Channel RIVER MILE: 687.6 – 688.0
HISTORIC DATA
Frequency: 52% Avg. Quantity/Job: 35,113 yd3
Last Date Dredged: June 27th, 2019 Avg. Quantity/Year: 18,259 yd3
SURVEY DATA
Date Surveyed: April 30th, 2020
Water Surface Elevation: 630.2
Low Control Pool Elevation: 629.7
Net Difference: +0.5’
5 Day River Forecast: Steady Decline
DREDGING DATA
Recommended Channel Width: 400 feet
Recommended Dredging Depth: 11 feet
Estimated Quantity: 18,988 yd3
Type of Dredge: Contract Mechanical plant 3
Actual Dredging Date: May 5th, 2020
Estimated Duration: 10 dredging days
Justification for Dredging: The navigation channel is reduced to 180’ between the 9.0’ contours and closed between the 10.5’ contours, on a bend with a recommended width of 400 feet.
MATERIAL PLACEMENT DATA
Proposed Placement Site: Brownsville Containment
Location: 8-688.7-RMP
Site Characteristics: This is a historically used beneficial use stockpile site. We expect all material to be removed.
If you have any questions concerning this project, or if you would like to request an onsite meeting, please call a dredging manager at (651) 290-5155.