Chippewa County High Risk Erosion Area Update · High Risk Erosion Area Update Water Resources...
Transcript of Chippewa County High Risk Erosion Area Update · High Risk Erosion Area Update Water Resources...
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Chippewa County
High Risk Erosion Area Update
Water Resources Division
2015
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Part 323,
Shorelands Protection and Management,
of the Natural Resources and
Environmental Protection Act,
1994 PA 451, as amended
Great Lakes Shorelands
Administrative Rules
281.21 - 22
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Erosion Happens
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Water levels change
600
600.5
601
601.5
602
602.5
603
1975 1985 1995 2005
Fee
t -
IGLD
85
Lake Superior
Long Term Average Average
2014
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USACE Projected Water Level January 2015
Lake Superior
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Sand comes…and it goes
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Storms
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On the Edge
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What is a High Risk Erosion Area?
• Erosion occurring an
average of 1 foot/year
over a minimum period
of 15 years
• DEQ studies movement
of the landward edge of
erosion
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Chippewa County Erosion Rates
Whitefish Township 8.3 feet /year
Bay Mills Township 1.1 feet/year
Superior Township < 1 foot/year
Soo Township 2.5 feet/year
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Recession Rate Studies
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HREA Maps
2015
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Designation Timeline�Letter to property owners and officials
�Public meetings
�Meet with local officials
�Comments, questions, informal appeals
�Formal designation letters
�Administrative appeals
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HREA Permit Not Required for
• Open decks, patios, or stairs
• Building 225 sq ft or smaller, not on
permanent foundation
• Unenclosed, uncovered swimming pools
• Routine maintenance
• Restoration of structure if cost is less than 60%
of replacement value
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Building on Designated Property
– Construct or relocate a permanent building
– Construct an addition
– Construct a detached structure larger than
225 sq ft, or on a permanent foundation
– Install or replace a septic system
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Readily-Moveable Structure Criteria
• First floor foundation: 3500 sq ft or less
• Garage: 676 sq ft or less
• Foundation: basement, crawl space, or pilings
• Above foundation walls: stud frame or whole log
• Exterior Siding: wood, vinyl, cement board, brick,
cultured stone or stucco
• No more than 4 living units
• Sufficient access for relocation
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Non-Readily Moveable Structures
• Structure does not meet RMS criteria
• Septic systems
• Existing structures which do not meet structural
criteria may be classified as RMS if:
cost of relocation landward of setback is not
more than 25% of replacement cost
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Erosion Hazard Line
• Depends on site characteristics
• Setbacks measured from either
– top of lakeward facing slope, or
– landward edge of active erosion.
– Elevation Contour – Lake Superior 604.4 ft
– Never measured from water’s edge
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Edge of active erosion located at
top of bluff
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Erosion Hazard Line
• Landward edge of
active erosion is
lakeward of top of the
bluff
• Setback may be
different from PRD -
dependent on bluff
height and slope of
bluff face.
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Locating a New Structure
Lake
Water’s
EdgeEHL
30-Year SB
Property Line
Property Line
RMS
Only
60-Year SB
RMS or
non-RMS
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The Permit Process
• Considers the site and the proposed project.
• Permit applications are available at www.michigan.gov/jointpermit
• Field staff will site inspect and make permit decision within 60 days from receipt of complete application.
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Summary
• Erosion happens
• Shorelines change
• Recession rates identify a hazard
• Setbacks are a planning tool
• DEQ permit
• www.mi.gov/shorelands