A06 40512685 Afterbay Site Plan Sht1.pdf

CP1

3166.66

CP2

3166.31

CP3

3163.11

Ex. 10" CMP Inv.=3162.99'

Existing Gravel Parking Area

Lat rin e

Dumpster

Replace ex. Jersey Barriers w/ 2'-3' rock

(min. 1' burial)

Surv eye d W ate r Li ne

8/11/20

Ele

v. 3

160.51'

Ex. Concrete Mat

Exi sti ng Con cre te

Boa t R am p

Remove exist. damaged concrete (approx. 90 SF)

40'

Proposed 40' wide x 15' long ramp extension

Contractor to protect exist. concrete boat ramp during construction

Class I Riprap 4'w x 2'd see detail

15'

DRAWN BY: DATE:

CHECKED BY: DATE:

APPROVED BY: DATE:

APPROVED BY: DATE: SH

EE

T:

of

APPROVED BY: DATE:

REVISED BY: DATE: Site Plan - Bighorn Canyon National Recreation Area

P. Jagoda 9/18/20

Scale:

30 60

EXISTING FEATURES

LEGEND

CONTROL POINT

CP2

PROPOSED FEATURES

EDGE OF ROAD

PROP. CONTOUR

EX. CONTOUR 110

BARRIER ROCKS

NOTES:

1. SITE SURVEY WAS COMPLETED BY MONTANA FISH, WILDLIFE & PARKS (MT FWP) ON

8/11/2020. VERTICAL DATUM FOR THE SURVEY IS BASED ON A BUREAU OF

RECLAMATION BENCHMARK, BRASS DISK, ELEV. 3172.010' MEAN SEA LEVEL, DATE

STAMPED 4-07-65, LOCATED ON NORTH SIDE OF RIVER TOP OF CONCRETE WALL, EAST

OF THE YELLOWTAIL AFTERBAY DAM. HORIZONTAL COORDINATES ARE BASED ON

MONTANA STATE PLANE.

2. ANY UTILITIES DEPICTED ON THESE PLANS ARE IN ACCORDANCE WITH THEIR ACHIEVED

"QUALITY LEVELS" AS DEFINED IN THE AMERICAN SOCIETY OF CIVIL ENGINEER'S

DOCUMENT ASCE 38, "STANDARD FOR THE COLLECTION AND DEPICTION OF EXISTING

SUBSURFACE UTILITY DATA." BEFORE DIGGING, CALL 811 FOR LOCATION OF EXISTING

UTILITIES.

3. THIS PROJECT IS A JOINT EFFORT WITH THE NATIONAL PARK SERVICE - BIGHORN

CANYON NATIONAL RECREATION AREA AND MT FISH, WILDLIFE & PARKS. THE DESIGN AS

PRESENTED HEREIN IS BEING PROVIDED BY MT FWP TO THE NPS FOR BIDDING AND

CONSTRUCTION.

4. CONTRACTOR TO PROTECT EXISTING BOAT RAMP FROM DAMAGE DURING

CONSTRUCTION. ANY DAMAGE TO THE EXISTING BOAT RAMP WILL BE REPAIRED AT THE

CONTRACTOR'S EXPENSE.

5. ROCK BARRIERS SHALL BE MINIMUM SIZE OF 2' TO 3' ROCK WITH A MINIMUM BURIAL

DEPTH OF 1'. CONTRACTOR TO SUBMIT ROCK MATERIAL FOR APPROVAL BY OWNER

BEFORE PLACEMENT.

NEW CONCRETE

RIPRAP

EX. CONCRETE

EX. VEGETATION

Desc. Northing Easting Elev.

CP1 393236.6043 2374710.7972 3166.66

CP2 393249.2991 2374734.8137 3166.31

CP3 393143.4362 2374623.8243 3163.11

BOR NORTH 393041.6157 2374497.3395 3172.01

BOR SOUTH 392784.7618 2374672.3643 3172.037

BENCHMARK NOTES:

1. BOR NORTH IS BRASS DISK LOCATED ON NORTH SIDE OF

RIVER, DATE STAMPED 4-7-65

2. BOR SOUTH IS BRASS DISK LOCATED ON SOUTH SIDE OF

RIVER, DATE STAMPED 7-1-65

Afterbay Boat Ramp Extension P. Jagoda 9/18/20

AutoCAD SHX Text

MH