Resolution 072-1976RESOLUTION NO. 72-1976
WHEREAS, the Department of Environmental Regulation has
conducted a biological survey on the Snake Creek Bridge Project
and in said survey has made proposed changes in the plans of the
Department of Transportation State of Florida's Project No. 90060-
3536, Proposed Filling in Snake Creek (S.R. 5), Monroe County,
Florida, and
WHEREAS, it is necessary for the Board of County Commis-
sioners of Monroe County, Florida, to enter the biological survey
into the records of a public meeting as required by the Florida
Department of Environmental Regulation, now, therefore,
BE IT RESOLVED BY THE BOARD OF COUNTY COMMISSIONERS OF
MONROE COUNTY, FLORIDA, that it has entered the biological report
into the records of the public meeting and it hereby reaffirms
its approval of Project No. 90060-3536, Proposed Filling in Snake
Creek (S.R. 5), Monroe County, Florida, as previously endorsed by
Resolution No. 25 -1976.
BE IT FURTHER RESOLVED BY SAID BOARD that certified copies
of this resolution be forwarded to the Department of Transportation
State of Florida for appropriate action.
DATED April 13, 1976.
BOARD -OF COUNTY COMMISSIONERS..OF. ,,4,,,..
1-40NROE COUN FLORIDA
/47
By �T
May r and Chairman
(Seal)
Attest:RALPH v :, 11K
OV Clerk
d ♦M.qr
STATE OF FLORIDA
r
• DEPARTMENT OF ENVIRONMENTAL REGULATION
2562 EXECUTIVE CENTER CIRCLE, EAST
•�"MONTGOMERY BUILDING
TALLAHASSEE, FLORIDA 32301
LOSE/H W. IANDERS A
:ccwnAN. April 9, 1976
Board of County Commissioners
of Monroe County
Monroe County Courthouse
Key West, Florida 33040
Gentlemen:
Snake Creek Bridge, D.O.T., Plantation Key
Monroe County, D.E.R. File No. 44-37-3683
A biological survey of the above referenced project has been
performed by our staff, and the following comments are provided:
The applicant proposes to construct a 230-ft. long
concrete bridge over Snake Creek, to emplace fill to
create the bridge approaches, to bulkhead the south side
of the bridge approaches, and to dredge to facilitate
installation of pilings. A majority of the proposed
work will extend below mean high water. The project site
is located immediately south of the existing Snake Creek
bridge.
Submerged bottoms in the subject area are composed of
shell fragments and marl mixed with organic debris.
Vegetation in the immediate area consists of turtle grass
and several species of macroscopic algae. Numerous fish,
including grunt, snapper, angelfish, parrotfish and
sargent majors, were present at the time of the survey.
Benthic marine invertebrates were prevalent throughout
the project area. Upland vegetation was restricted to
the southeast side of the project area, and consisted of
red, white and black mangroves and buttonwood.
The immediate impact of the project upon the area would
be the elimination of the submerged vegetated substrate
adjacent to the bridge by filling. The removal of the
existing vegetation along the approaches and apron will
result in siltation and stabilization problems in the
immediate future. Long-term impact may result by continual
Board of County Commissioners
Page. Two
April 9, 1976
sediment runoff from the apron and approach area, possibly
silting over adjacent vegetated bottoms.
The design of the proposed bridge includes bulkheaded
bridge approaches with the bulkheads angled 90 degrees
from the shoreline. A 90 degree bulkhead projecting into
Snake Creek would act as a discontinuity along the shore-
line. Because of the water velocity in Snake Creek, the
rubble base around the bulkhead may be expected to erode
rapidly away, possibly undermining the bulkhead. Loss of
the bulkhead would directly affect the bridge approach.
Positioning of the bulkhead will adversely affect storm
surge tides by narrowing and lengthening the route of
turbulent flow under the bridge. These approaches have
been severely damaged from past storm surges due to the
same cause. A bulkhead line angled (note attached diagram)
to facilitate passage of water flow should provide less of
a discontinuity. This would also reduce the amount of fill
required along the south side of Snake Creek. Serious
consideration should be given to the idea of increasing
the bridge span. This would avoid the costs of procuring,
hauling, placing and stabilizing a large portion of the
proposed fill in Snake Creek. It would also tend to elimi-
nate most of the bulkheading in the present location.
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DFF/j tp
Enclosure
Sincerely,
Dan F. Farley, Director
Division of Environmental
Permitting
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Snake Creek Bridge
44-37-3683
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