DN 20-22                                           DREDGING NOTICE

                                              U.S. ARMY CORPS OF ENGINEERS

                                                            ST. PAUL DISTRICT

NOTICE DATE: June 12^th, 2020                               DREDGING CATEGORY: Imminent

MEETING DATE: If requested                                 MEETING TIME:

BOAT REQUIREMENT:                                          MEETING LOCATION:

DREDGE CUT NAME: Lower Zumbro                   RIVER MILE: 743.5 – 744.4

HISTORIC DATA

Frequency: 62%                                              Avg. Quantity/Job: 32,532 yd³

Last Date Dredged: November 7^th, 2019       Avg. Quantity/Year: 20,170 yd³

SURVEY DATA

Date Surveyed: June 9^th, 2020

Water Surface Elevation: 669.6

Low Control Pool Elevation: 659.4

Net Difference: +0.2

5 Day River Forecast: Slight increase

DREDGING DATA

Recommended Channel Width: 300 feet

Recommended Dredging Depth: 12 feet

Estimated Quantity: 46,662 yd³

Type of Dredge: Government Hydraulic

Proposed Dredging Date: June 12^th, 2020

Estimated Duration:  6 Dredging Days

Justification for Dredging: The channel is reduced to 310’ between the 9’ contours and 115’ between the 10.5’ contours.

MATERIAL PLACEMENT DATA

Proposed Placement Site: Lost Island

Location: 5-744.7-LWT

Site Characteristics: This is a historically used temporary placement site.

If you have any questions concerning this project, or if you would like to request an on‑site meeting, please call a dredging manager at (651) 290-5155.