K20448_HG02_Add2.pdf
PDF 363 KB Posted
- Attached to
- US101: Trask River Bridge Proj.
- Solicitation number
- S-73000-00016851
- Issued by
- Tillamook County, Oregon
About this file
This is a technical design document (Addendum 2) for Tillamook County, Oregon, related to the US 101 Oregon Coast Highway Trask River Bridge Project managed by the Oregon Department of Transportation. The document provides detailed engineering specifications and construction drawings for abutment protection and bank stabilization work associated with the bridge project. The drawings include three cross-sectional views (Sections A-A, B-B, and C-C) depicting abutment protection details at various stationing points (0+00 and 1+200+00) along the project corridor. The specifications outline riprap placement, geotextile requirements, final grade elevations relative to ordinary high water (OHW) at elevation 17, and slope configurations with ratios of 1.5:1. The document was prepared by DOWL engineering firm with multiple reviewers and designers involved, including Jared Trowbridge, Benjamin Wewerka, Russell Ewing, and Serban Dinca, and is dated for expiration on 06/30/2024 with a final revision date of April 9, 2026.
The design specifications include detailed requirements for large woody material placement, including acceptable coniferous species (spruce, hemlock, cedar, Douglas fir) with specific embedment depths, projected lengths, and diameter requirements ranging from 18 to 24 inches. Root wads may be salvaged from trees removed during construction to support bank stability and ecological restoration. The document specifies Class 200 riprap with minimum thickness requirements of 2 feet and maximum protection lengths up to 31 feet. Topsoil and seeding provisions are referenced on sheet FA01, and the engineering drawings are scaled at 1 inch equals 20 feet for implementation by construction contractors.
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Other files
| File | Type | Posted |
|---|---|---|
| 00016231_Att B_Sample Public Improvement Contract~1.docx | DOCX document | |
| Exh 5 to Sample Contract_Specs.docx | DOCX document | |
| Exhibit 7-4 to Sample Contract_County Floodway Development Permit.pdf | ||
| 00016851_Att A-2_Bid Pricing Form.xlsx | XLSX spreadsheet | |
| Updated Contaminated Soil Location Table 00294-1.docx | DOCX document | |
| 00016851_Att A-2_Bid Pricing Form_REVAdd6.xlsx | XLSX spreadsheet | |
| Exhibit 7-2 to Sample Contract_DSL Permit.pdf | ||
| 00016851_Att B_Sample Public Improvement Contract.docx | DOCX document | |
| Exhibit 7-3 to Sample Contract_Army Corps Permit.pdf | ||
| 00016851_ITB.docx | DOCX document | |
| Exh 6 to Sample Contract_Plans.pdf | ||
| Exhibit 7-1 to Sample Contract_DEQ Permit Req.pdf | ||
| 00016851_Q and A_6.15.docx | DOCX document |
Show all 13
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Text version
WWW.DOWL.COM
Checker:Drafter:
Designer:
SHEET NO.
Reviewer:
AVAILABLE UPON REQUEST
FINAL ELECTRONIC DOCUMENT
TILLAMOOK COUNTY
OREGON COAST HWY.
US101: TRASK RIVER BRIDGE PROJ.
F
O T
N E
MTRAPED
N
O G
E R
O
N
OI
T
ATROPS
N A
R T
Jared Trowbridge
Benjamin Wewerka
Russell Ewing
Serban Dinca
EXPIRES: 06/30/
4, E
I E
E S
E OF
S
O N
OREGON
79131PE
U
NE 20
N G N E R
R G I
TE
R
DPR E
SI
A L
J
J
AMIN EW
E
R K
A
WP.
N E
B
HG02
SECTION A-A: ABUTMENT PROTECTION DETAIL
SECTION B-B: ABUTMENT PROTECTION DETAIL
1+200+00
1+200+00
SECTION C-C: ABUTMENT PROTECTION DETAIL
0+00 1+20
See sht. HG01 for the location of Sections A-A, B-B & C-C.
NOTE:
1.5:1 type 2
Riprap geotextile, Final grade
Extg. ground
:1
1.5:1
2'
8.2'
2' :1
8.5' 1.5:1
M in
Final grade
Extg. ground type 2
Riprap geotextile, OHW (Elev. 17)
OHW (Elev. 17) type 2
Riprap geotextile, 1.
5:
1.5:1
(Class 200)
Loose riprap m in
Varies - 31' max.
(2' min. thickness)
Soiled riprap (Class 200) w/ rootwad
Large woody material
Top of log - Elev. 6.7'
(Class 200)
Soiled riprap
HY_K20448_hy_04.dgn :: Default 3/5/2026 11:27:16 AM rduerst 1"=20' Scale: Rotation: 0° for seeding
Top soil. See sht. FA01
BANK PROTECTION DETAILS
Top of log - Elev. 10.7'
Top of log - Elev. 14.7'
Extg. ground Final grade
(P)
Length
Projected
(D)
Diameter
(E)
Length Min.
Embedment
Min.
Length
Total spruce species.
hemlock, cedar, douglas fir and/or
Acceptable species are coniferous fir, trees removed during construction.
1. Root wads may be salvaged from
NOTES:
LARGE WOODY MATERIAL DETAIL
Top of slope
P
Projected length
H c
V a r ie s
D
1.
5H:
1V
Proposed grade
Root wad
Toe of slope
Extg. ground
E length Embedment
18" 5'-0" 12'-0" 17'-0"
Thalweg
NOT TO SCALE
24" 5'-0" 15'-0" 20'-0"
(Hc)
Min.
Clearance
Bottom
2'-0"
2'-0"
H c
59V-069
| 2026-04-09T09:10:35-0700 | |
| Benjamin Wewerka |
File details come from the government source that posted it. Updated .