S-C00055-00013418 ADDENDUM No 1 - RFP Bridge Engineering Services - Little Clat Confluence.pdf

PDF 2 MB Posted Apr 7, 2025

Attached to: RFP Bridge Engineering & Related Svs State and local contract opportunity
Solicitation number: S-C00055-00013418
Issued by: Coos County, Oregon

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Written by GovTribe AI · Apr 28, 2025

This document is an Addendum No. 1 issued by Columbia County's Department of Public Works for a Request for Proposals (RFP) S-C00055-00001348 for Engineering and Related Services for Bridge Installation at the Little Clatskanie River Confluence (Apiary Road MP 8.4). The addendum, dated April 14, 2025, addresses the RFP released on April 07, 2025, and provides clarification on design plans and project budget. The design budget for the project is estimated between $180,000 and $250,000, with pricing to be determined during contract negotiations with the most qualified consultant. Planholders are required to sign and acknowledge this addendum and include it with their submitted proposal.

The addendum indicates that 30% design plans have already been completed and will form the basis for the final design crossing. These plans were not originally included in the initial RFP but are now attached for reference. The project involves bridge installation with specific technical requirements, including precast prestressed slabs, steel pile foundations, and specific hydraulic considerations. The document notes that utility relocations will be required, including CenturyLink communication lines and West Oregon Electric lines, which will be handled by others. The project is being undertaken by the Columbia County Soil & Water Conservation District and is designed in accordance with 2017 AASHTO LRFD Bridge Design Specifications and 2021 Oregon Standard Specifications.

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Other files for this state and local contract opportunity

Other files attached to RFP Bridge Engineering & Related Svs, newest first.
File	Type	Posted
HE1649-25 Oregon Buys Posting Page.pdf	PDF	Apr 7, 2025
RFP Bridge Engineering Selection - FINAL.pdf	PDF	Apr 7, 2025
S-C00055-00013418 ADDENDUM No 2 - RFP Bridge Engineering Services - Little Clat Confluence.pdf	PDF	Apr 7, 2025

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Extg. ground @ 40' Lt.

Extg. ground @ 40' Rt.

Extg. ground @ ℄ Roadway

ELEVATION

Scale: 1" = 10'-0"

Std. guardrail transition, typ. all four corners, see Dwg. BR203

Bent 1

85'-714" ±Type "F" concrete bridge rail, see Dwg. BR200

OHW El. 614

Scour prism: 28.5' wide x 1.1' below downstream thalwegCIP Scour wall, typ.

Wingwall, typ.

Bent 2

Note:

Elevations shown are based on North American Vertical Datum 1988 (NAVD88).

Low chord El. 624.86

Finish grade, typ.

HP14x89 steel piles in prebored holes, extend 10' into bedrock, typ.

Embed bottom of wingwall and scour wall 12" into bedrock or to Elev. 610.5, whichever is shallower

Design flood El. 617.3

El ev at io n in fe et

3'-0" Low flow channel

1' -0

Backfill scour wall excavation with Class 100 riprap placed outside the scour prism, typ.

2'-0" deep native streambed gravels inside scour prism

Reconstruct low flow channel to meet the following points:

Offset 62.5' Elevation 611.0 Offset 37' Elevation 610.7 If bedrock is encountered at a higher elevation, contact the engineer for direction.

Grade to match existing channel thalweg at ROW.

10H:1V, Typ.

1.5' Deep Class 100 riprap along upstream wingwalls, 2' Deep Class 200 riprap along downstream wingwalls

20'-4" Std. Bridge End panel with drainage curb, see Dwg. BR165, typ.

CenturyLink communication lines to be relocated (by others)

L itt le

Cl at sk an ie Ri ve r

Sta. 12+96.51 ℄ Bent 1

Sta. 13+40.51 ℄ Bent 2 Overhead West Oregon

Electric line to be relocated (by others)

S26°34'54"W

℄ Roadway

Apiary Road

Extg. contours

44'-0" Ctr. to ctr. end bents 9 - 15" Precast Prestressed Slabs, See Dwg. BR420

PLAN

Scale: 1" = 10'-0"

0" La ne

La ne

4' -8

Sh ld r.

4' -8

Sh ld r.

Std. guardrail transition, typ. all four corners, see Dwg. BR203

0" O ut

O ut

Existing culverts to be removed

Type "F" concrete bridge rail, typ. See Dwg. BR200

Class 200 riprap placed outside scour prism along downstream wingwalls, typ.

90°Typ.

Class 100 riprap placed along face of bent and upstream wingwalls

PLAN AND ELEVATION JA01

Makenzie Ellett

Jim Culpepper

Amanda Blankenship

Craig Shike

OJE

MAXIMUMDESIGN BASE PROBABLEUNITS

617.30

618.14

0.02

619.03

0.00

- 1.33 1.12 years feet feet feet

FLOODFLOOD FLOOD

ft. /s3 524 674 850

LOCATION MAP

No Scale

SEC. 22, T.6N., R.3W., W.M.

LAT. 45.98832, LONG. -123.03960

HYDRAULIC DATA

RECURRENCE INTERVAL

BACKWATER

SCOUR DEPTH

HIGH WATER ELEVATION

AT UPSTREAM FACE OF

BRIDGE ALONG

EMBANKMENT

ITEMS

DISCHARGE

Reviewer:

Checker:Drafter:

Designer:

SHEET NO.

STRUCTURE NO.

BDS DWG NO.

CALC. BOOK

HWY:

M.P.: 8.4

DATE

12/2020

COUNTY

Columbia

DESIGN ACCEPTANCE

PLANS

INFORMATION ONLY

FINAL ELECTRONIC DOCUMENT

AVAILABLE UPON REQUEST

COLUMBIA COUNTY SOIL & WATER

CONSERVATION DISTRICT

APIARY RD CULVERT MILEPOST 8.4 REPLACEMENT

APIARY ROAD

LITTLE CLATSKANIE RIVER, APIARY ROAD

COLUMBIA COUNTY

530 Center Street N.E., Suite 605

Salem Oregon 97301

Phone: 503.361.8635

\\deainc.com\files\PROJECT\C\CMCDSWCD0001\0400CAD\SHEETS\JA01-CMCDSWCD01-PE01.dwg 12/9/2020 2:51 PM Dustin Altenburg

Notes:

At the location of the new bridge, the ROW is located at approximately 40' lt. and rt. offset from ℄ Roadway.

The proposed bridge span exceeds the required width of

1.5 times Active Channel Width, which is equal to the scour prism width of 28.5 feet.

12'-0" Lane

4'-8" Shld.

36'-0" Out - Out

12'-0" Lane

4'-8" Shld.

3" Min. ACWS 2% Sl. 2% Sl.

TYPICAL SECTION

Scale: 3/16" = 1'-0"

9-15" Precast prestressed slabs, see Dwg. BR405

℄ Bridge = ℄ Roadway 1'-4" Rail

1'-4" Rail Type "F" concrete bridge rail, typ.

See Dwg. BR200

GENERAL NOTES:

Provide all materials and perform all work according to the 2021 Oregon Standard Specifications for Construction.

Bridge is designed in accordance with the 2017 AASHTO LRFD Bridge Design Specifications (including interim revisions) and the 2020 ODOT Bridge Design Manual (BDM), updated June 2020.

Gradeline diagram to be provided in the final design phase.

The structure is laid out to match existing grade.

CONSTRUCTION SEQUENCE:

Construct using staged construction.

1. Install traffic control to provide one lane, two-way traffic.

2. Install piles through existing roadway.

3. Install temporary jump spans over new abutment cap excavation. Form and pour abutment caps.

4. Close bridge to all traffic for up to four weeks.

5. Remove existing culverts and reconstruct streambed.

6. Place slabs with precast, integral concrete bridge rail.

7. Form and pour scour wall and wingwalls.

8. Construct approach guardrail and top lift paving.

9. Open to traffic.