BUILDING STRONG ® and Taking Care of People! ALTERED HYDROLOGY – EFFECTS ON UPPER MISSISSIPPI RIVER DREDGING AND HABITAT RESTORATION Presented at the Upper Mississippi River Conference, Moline, Illinois, October 24, 2019 Jon Hendrickson, St. Paul District Corps of Engineers
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BUILDING STRONG® and Taking Care of People!
ALTERED HYDROLOGY –
EFFECTS ON UPPER
MISSISSIPPI RIVER DREDGING
AND HABITAT RESTORATION
Presented at the Upper Mississippi River
Conference, Moline, Illinois, October 24, 2019
Jon Hendrickson, St. Paul District Corps of
Engineers
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BUILDING STRONG® and Taking Care of People!
Navigation
Upper Mississippi River Restoration (UMRR) Program
Hydrologic Trends
Water Exchange Rates
Dredging Trends
Future Challenges
AGENDA
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BUILDING STRONG® and Taking Care of People!
Upper
Pool 9
Lower
Pool 8
EMPHASIS IS ON REACH FROM LOCK & DAM 2-10
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BUILDING STRONG® and Taking Care of People!
Dredging and Dredge Material
Management …
Average dredging season length = 178 days,
range = 106 to 237 days
Islands E1 & E3
Pool 5
Dredge Goetz
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BUILDING STRONG® and Taking Care of People!
UPPER MISSISSIPPI RIVER RESTORATION PROGRAM
Authorized by Congress in 1986 Two Elements 1. Habitat Rehabilitation and Enhancement Projects 2. Long-Term Resource Monitoring
Three Districts
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BUILDING STRONG® and Taking Care of People!
ISLAND CONSTRUCTION
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Capoli Slough, 2013
Weaver Bottoms, 1986
Spring Lake, 2005
Pool 8, Phase II, 1998
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BUILDING STRONG® and Taking Care of People!
ISLAND CONSTRUCTION
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BUILDING STRONG® and Taking Care of People!
STAGE
Granular (sand) Used and Source Benefits to Channel Maintenance?
Stage 3A 340,000 yd3 of granular fill from placement
sites
Provided 5 years of additional capacity at
placements sites
Stage 3B 165,000 yd3 of granular fill from navigation
channel cuts
No Benefit – Sand was obtained from a
reach of channel that isn’t normally
dredged.
POOL 8, PHASE III, STAGE 3A AND 3B ISLANDS
Note – Average Annual Dredging for Pool 8 is 72,000 yd3/year for the years 1981-2018
Stage 3A
Stage 3B
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BUILDING STRONG® and Taking Care of People!
FLOOD EFFECTS ON PROJECTS
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Islands were stable during the 1993
flood. Note green rows of grass
beneath water
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BUILDING STRONG® and Taking Care of People!
HYDROLOGY
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Average Annual Discharge at Winona
1943 to 1980 = 29,000 cfs
1981 to 2018 = 36,700 cfs (26.5 % increase)
2016, 2017, and 2018 = 45,000, 48,000 and 51,000 cfs