FLOOD10328

• County: Boulder
• Community: Lyons
• Stream Name: North Saint Vrain and Saint Vrain Creeks
• Title: Floodplain Information Report, North Saint Vrain Creek, Saint Vrain Creek, Floodplain Update, Town of Lyons, Boulder County, Colorado
• Date: 6/1/1998
• Prepared For: Lyons
• Prepared By: BRW, Inc
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Floodplain Information Report
K:\35600\004\FLOODPLAIN INFORMATION REPORT.doc

33

June

998

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3S' Brass Cap Stamped: "us
Coast & Geodetic Survey A329
1957"

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A329

5241.28

5241.22

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Z410

GAGING
STATION

5266.73

5296.65

Brass Cap Stamped: "Bureau of
Reclamation BM 7 53033241936"
3.75" Brass Cap Stamped: US
Geological Survey Gaging
Station Reference Mark"
OS' Rounded Rod in Range Box
Stamped: "Z410 1984"

South side of US Hwy 66/CO
Hwy 36, 200' :t West of the
Intersection of US Hwy 66/CO
Hwy 36.
Bridge Abutment

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HEADGA TE

5305.28

5305.56

3.5" Brass Cap Stamped
A4111984"

East side of Highway 36,
opposite of Headgate, 5' High
on Vertical Cliff.
Southeast end of a Wingwall of a
Headgate of an Irrigation Canal.
Gaging Station on Highway 36

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CLIFF

5305.96

5306.22

NGS

North of Intersection of Park
Ave. & Highway 36 West of
Black Bear Inn.

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BM4

5316.91

Chiseled Square on Top of Inlet

Chiseled Square
Sidewalk

Northeast corner of Sidewalk
(close to Tele. Ped.) 84' So. Of
Evans, on 2nd Ave.

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BM3

5322.59

on

Chiseled Square on
Concrete Headwall

Top

of

Northwest corner
and 3'" Ave.

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BM2

5334.44

Chiseled Square
Retaining Wall

Top

of

of

East End of Retaining Wall on
South Side of Evans, East of 4th
Ave.

Evans St.

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BMl

5335.61

East

3"Brass Cap Stamped: "US
Bureau of Public Roads 1955
5342.24"

End of

Northwest corner of Bridge
Curb on 5th Ave. and N. St. Vrain
Creek.

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SVClO

5342.75

5342.79

3.5" Brass Cap Stamped: US
Dept. of Interior Geological
Survey 5375 Re-Set 1968"

71' North of Intersection of 5in
Ave. & Main St., along West
Curb of 5th Ave.

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RMl

5367.68

5367.54

3" Brass Cap Stamped: "0 15 N
CDOH Benchmark ST A EL"

Northwest Wing Wall of Bridge
over No. St. Vrain Creek, on
Highway 36/State Highway 66.

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BRIDGE

5375.84

Brass Cap near Southeast corner
of Bridge at Highway 36 and
Apple Valley Road Intersection.

Northwest Wingwall of Bridge
over N. St. Vrain Creek, on
Highway 38/State Highway 66.

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SVC9

5404.20

MGVD 29
PUBLISHED
EL.
5404.20

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BM NAME

NORTH ST. VRAIN

BRW EL.

DESCRIPTION

TABLE7A
ST. VRAIN CREEK BENCHMARK INFORMATION

LOCATION

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North St. Vrain & St.
Floodplain Update

Vrain Creeks

Town of Lyons