i-205 corridor widening project mobility advisory ... document...flythrough animation project start:...

I-205 Corridor Widening Project Mobility Advisory Committee4/17/18

Attended September, ’17; February, ’18; and March ‘18 MAC Meetings Permanent changes to vertical

clearances Reviewed OR 43 roundabout concept

Today’s Focuso Temporary Traffic Impacts for

Abernethy Bridge Worko Temporary Traffic Impacts for Rock

Blasting Worko Input on Detour Strategies for Limited

Duration Activities

Prior MAC Coordination

3

Project Overview: Flythrough Animation

Project Start:Stafford Road Interchange, MP 2.9

Project End:OR 213 Interchange,MP 9.6

Abernethy Bridge Construction StagingAbernethy Bridge Launch - Sequencing

General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure• Slide existing main span southbound structure under weekend closure• Construct remaining cantilever widening towards median (8 feet +/-)

Existing Abernethy Bridge Section View

Abernethy Bridge Construction StagingAbernethy Bridge Launch – Estimated Timing

General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure • Slide existing main span southbound structure under weekend closure• Construct remaining cantilever widening towards median (8 feet +/-)

Abernethy Bridge Section View with Outside WideningWiden prior to bridge launch


General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure

• (Assumed to occur late 2021 or early 2022)• Slide existing main span southbound structure under weekend closure

• (Assumed to occur approximately 1 to 2 months after northbound launch)• Construct remaining cantilever widening towards median (8 feet +/-)

*Potential bridge launch timing is still under refinement and subject to change

NB moveSB move

Abernethy Bridge Construction StagingTraffic Handling Alternatives

Traffic Management Options for Bridge Launch• Option A: Full Regional

Directional Detour• Option B: Regional

Directional Detour with limited local interchange access (Hard Closure at Abernethy Bridge)

• Option C: Regional Directional Detour with crossover at Abernethy Bridge

Abernethy Bridge Construction StagingTraffic Handling Alt: I-205 Weekend Closure Detours

I-205 NB Closed:• Require advanced notice of

closure date• Advanced signing of I-205 NB

closure• I-205 NB closed from I-5 to OR

99E• Detour to I-5 and I-84

Abernethy Bridge Construction StagingTraffic Handling: I-205 Weekend Closure Point Options

I-205 NB Closed –Alternative Access:• Access to OR99E and OR213

from south of Wilsonville• Local destination access via I-5

interchanges• Alternative “local” detour using

I-5 to OR 99E and OR 224 (Milwaukie Expressway)

“Hard Closure” of I-205 @ I-5

Abernethy Bridge Construction StagingTraffic Handling Alt: I-205 Weekend Closure Detours

I-205 SB Closed:• Require advanced notice of closure date• Advanced signing of I-205 SB closure

beginning in WA• Multiple locations under consideration for

“Hard closure”• Detour to I-5 and I-84

Abernethy Bridge Construction StagingTraffic Handling: I-205 Weekend Closure Point Options

I-205 SB Closed –Potential closure points:• @ I-84 (with or without local

access on I-205 SB)• @ OR212/224 (with or without

local access to OR 213)• @ OR 213 (with or without local

access at OR 99E)

@ I-84

@ OR224

@ OR213

Abernethy Bridge Construction StagingTraffic Handling Alt: Crossover

2-Lanes / 2-Lanes

2-Lanes / L-lane3-Lanes / 1-Lane

Only achieves 27 feet each direction

Rock Cut Construction StagingRock Blasting Area

Rock cut heights 20 to 40’



Rock Cut Construction StagingTraffic Handling Approach

Option (1): Blast Groupings requiring 30-40 Rolling Slow Downs• Blasting Duration = 7-8 Months

Option (2): 20-30 Rolling Slow Downs + 2 Full Weekend Closures (larger-blasts)• Blasting Duration = 6-7 Months


Blast Work (done in Groupings)• Pioneer Access Road – 1 week• Drill blast holes (1-2 Wks), fire Pre-split blast (1D) • Drill production Blast (1 Wk), fire Production Blast (1D)• Rough sizing and haul (1 Wk)

Rock Cut Construction StagingRolling Slow Down Description

Operations During Rolling Slowdown• Close all local interchange ramps and initiate rolling slowdown• Perform safety check and give “all clear”• Perform Blast• Give “all clear” indicating no undetonated charges• Perform clean-up and inspection of roadway• Resume traffic operations


Assumed Rock Blasting Timeline• Considering a range of timeframe for the work to occur (earlier in project vs. later)• Considering contracting options to limit total duration of rock removal (complete start to finish

duration)• Considering incentive / disincentive options to limit traffic impacts

Potential Blasting Window #1

Potential Blasting Window #2

*Potential bridge launch timing subject to change

Future MAC Meeting Topic

May, 2018• Overall Project Construction Sequence and Staging

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