DN 16-20 DREDGING NOTICE
U.S. ARMY CORPS OF ENGINEERS
ST. PAUL DISTRICT
NOTICE DATE: August 5th, 2016 DREDGING CATEGORY: Imminent
MEETING DATE: If requested MEETING TIME:
BOAT REQUIREMENT: MEETING LOCATION:
DREDGE CUT NAME: Fisher Island RIVER MILE: 744.9 – 745.3
HISTORIC DATA
Frequency: 78 % Avg. Quantity/Job: 44,887 yd3
Date Last Dredged: May 6th, 2015 Avg. Quantity/Year: 35,129 yd3
SURVEY DATA
Date Surveyed: August 2nd, 2016
Water Surface Elevation: 660.6
Low Control Pool Elevation: 659.4
Net Difference: +1.2
5-Day River Forecast: Steady Decline
DREDGING DATA
Recommended Channel Width: 500 feet
Recommended Dredging Depth: 12 feet
Estimated Quantity: 50,585 yd3
Type of Dredge: Government Hydraulic
Proposed Dredging Date: August 7th, 2016
Estimated Duration: 7 dredging days
Justification for Dredging: The navigation channel is reduced to 240’ between the 9’ contours and closed between the the 10.5’ contours. On a recommended bend width of 500’.
MATERIAL PLACEMENT DATA
Proposed Placement Site: Above Fisher Island
Location: 5-745.8-RMT
Site Characteristics: This is a historically used island transfer site.
If you have any questions concerning this project, or if you would like to request an on‑site meeting, please contact the Channel Maintenance Coordinator at 651-290-5155.