Addendum 1 Attachment C Sheet C17 Revised 11122025.pdf
PDF 1 MB Posted
- Attached to
- ITB South Slough Entrance Improvement Project
- Solicitation number
- S-DASOBO-00014838
- Issued by
- Coos County, Oregon
About this file
This is an addendum technical drawing (Sheet C17 Revised) prepared for the Oregon Department of State Lands' South Slough Entrance and Roadway Improvements Project, which involves upgrades to Seven Devils Road in Charleston, Oregon. The drawing specifies the design and construction details for a Seven Devils Road turn lane and roadway widening project at 45 mph design speed. The project includes roadway reconstruction with new asphalt paving, updated striping with left turn arrows and no-pass markings, gravel shoulders, and compliance with ODOT traffic line manual standards. Site work requires clearing sight obstructions greater than 36 inches within the vision clearance triangle per Coos County Code 7.1.525, establishing a 25-foot clear zone, and implementing a typical section featuring a 12-inch compacted dense-graded aggregate base, geogrid reinforcement, and a 2-inch Level 3 HMAC overlay. The subgrade must achieve 95 percent relative compaction per ASTM 698 standards through proof-rolling with a minimum of four passes using equipment such as a 30,000-pound tamping foot roller. Pavement widths of travel lanes and right-of-way boundaries conform to the layout shown on the sheet, with a 2 percent minimum roadway crown and match-to-existing vertical alignment at road edges. The drawing was revised and dated November 12, 2025, and prepared by CivilWest Engineering Services, with the design reflecting final plan specifications for the South Slough Entrance and Roadway Improvements Project as of August 2025.
View the file
Other files
Show all 15
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
E
SEVEN DEVILS RD - TYPICAL SECTION
C17
NTS
N
EXISTING 7 DEVILS
ROAD, EXTENT OF
SURVEYED
ROADWAY
DESIGN LAYOUT AS PER
ODOT TRAFFIC LINE
MANUAL AT 45 MPH DESIGN
SPEED
EXISTING 7 DEVILS ROAD
STRIPING TO BE
REPLACED PER ORIGINAL
LAYOUT
7 DEVILS RD10.0'
10.0'
180.0' 14.0'
12.0' 12.0'
135.0'
TAPER
= 45:1
PROVIDE
40'
CONFORM
GRIND AT
TIE IN
POINT TO
EXISTING
ROADWAY
630.0'
1.0' GRAVEL SHOULDER, TYP.
R45.0'
R45.0'
300.2' CLEAR
ZONE DISTANCE
25.0' CLEAR
ZONE DISTANCE
ROW BOUNDARY
APPROXIMATE
LOCATION, TYP.
150' x 25' VISION
CLEARANCE
TRIANGLE AS PER
COOS COUNTY
CODE 7.1.525.
ELIMINATE
EXISTING TREES
AND OTHER SIGHT
OBSTRUCTIONS
GREATER THAN 36"
WITHIN TRIANGLE
AS PER CODE
61869 SEVEN DEVILS RD
MAP NO: 26S14W26
OWNER: LEE, CHARLES F
PROPOSED
NEW
ASPHALT,
SEE
C17
NEW 7 DEVILS
ROAD STRIPING
LEFT TURN
ARROW
8" WHITE
LINE4" WHITE
LINE
NARROW DOUBLE NO-PASS
4" YELLOW LINES
DOUBLE NO-PASS 4"
YELLOW LINES
12" COMPACTED LAYER
DENSE-GRADED 3/4"-0" AGGREGATE
(COMPACTED TO 95% RC)
COMPACTED SUBGRADE TO BE ROLLED
WITH A MINIMUM OF FOUR PASSES
OF A 30,000LB TAMPING FOOT ROLLER OR
PROOF ROLLER WITH LOADED DUMP TRUCK OR
WATER TRUCK
2" OF LEVEL 3
12" DENSE GRADED HMAC
BASE LIFT
(1)-2" LIFTS
WITHIN AREAS NOT CURRENTLY CONTAINING
ROADWAY
COMBI-GRID GEOGRID OR APPROVED EQUAL
NOTES:
1) WIDTHS OF TRAVEL LANES AND RIGHT OF WAY SHALL CONFORM TO THE LAYOUT AS SHOWN ON THIS
SHEET.
2) COMPACTION OF SOIL AND AGGREGATE MUST ACHIEVE 95% RELATIVE COMPACTION (RC) OF THE
STANDARD PROCTOR MAXIMUM DRY DENSITY PER ASTM 698.
3) SUBGRADE SURFACE SHALL BE PROOF-ROLLED AND ANY SOFT OR LOOSE AREAS MUST BE REPAIRED
WITH FOUNDATION STABILIZATION.
2% MIN2% MIN
ROADWAY
CROWN
1 SEVEN DEVILS TURN LANE
C17
D at e Sh ee t N o.
D
AT
E:
/1 2/
F
IL
E:
S:
\2
M is c Pr iv at e En gi ne er in g W or k\
-3
S ta te o f O re go n
- S ou th S lo ug h En tra nc e an d R oa dw ay Im pr ov em en ts \0
D es ig n Se rv ic es \C
AD
\2
4-
D
ES
IG
N
.d w g
R
EV
D
AT
E
D
ES
C R
IP
TI
O N
BY
D
ES
IG
N
ED
B
Y:
D
R
AW
N B
Y:
C
H
EC
KE
D
B Y:
PR
O
JE
C
T N
O
PR
EP
AR
ED
B Y:
C oo s Ba y, O re go n
E St re et w w w .c iv ilw es t.c om
1-
6-
R
EG I N
E
N
11, S
PE
89522PE
OREGON
E
0SEAN D A L LOYD
RENEWS: 12/31/26
REG
ISTERED PROFESS IONAL
E N
C17
SO
U
TH
S
LO
U
G H
E N
TR
AN
C E
AN
D
R O
AD
W
AY
IM
PR
O
VE
M
EN
TS
O R
EG
O
N D
EP
T.
O F
ST
AT
E
LA
N D
S
BD
/S
D L
BD
/S
D L
SD
L/
W D
-3
SE
VE
N D
EV
IL
S
TU
R N
L A
N E
AUGUST 2025
SE
VE
N
D
EV
IL
S
R D
, C H
AR
LE
ST
O
N , O
R
4" WHITE
LINE
WIDTH VARIES1.0'
4" DEPTH SHOULDER
DENSE-GRADED 3/4"-0" AGGREGATE
(COMPACTED TO 95% RC)
1.0'
2" OF LEVEL 3
12" DENSE GRADED HMAC
OVERLAY TO CREATE CONTINUOUS SURFACE
OVER WIDENED EXISTING ROADWAY
CLEAN AND TACK EXISTING ROADWAY PRIOR TO
OVERLAY
PROVIDE
40'
CONFORM
GRIND AT
TIE IN
POINT TO
EXISTING
ROADWAY
AREA OUTSIDE OF SURVEY LIMITS
FIELD COORDINATE HORIZONTAL
ALIGNMENT WITH FIELD
REPRESENTATIVE
MATCH VERTICAL ALIGNMENT
EXISTING
ROADWAY EDGES
/1 2/
EX
IS
TI
N
G R
O
AD
L
IM
IT
C
LA
R
IF
IC
AT
IO
N
S
D L
AutoCAD SHX Text
%%U PLAN SCALE
AutoCAD SHX Text
AutoCAD SHX Text
AutoCAD SHX Text 1"=80'
AutoCAD SHX Text
AutoCAD SHX Text
AutoCAD SHX Text
AutoCAD SHX Text
FINAL PLANS
| Sheets and Views |
| C17 |
File details come from the government source that posted it. Updated .