DN 20-08                                           DREDGING NOTICE

                                              U.S. ARMY CORPS OF ENGINEERS

                                                            ST. PAUL DISTRICT

NOTICE DATE: May 4^th, 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 27^th, 2019               Avg. Quantity/Year: 18,259 yd³

SURVEY DATA

Date Surveyed: April 30^th, 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 5^th, 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.