SECTION A FACING NORTH AT TUNNEL, WATER AVENUE ARTERIAL AND UPRR EASTBANK FREEWAY TUNNEL ALTERNATIVE - DRAFT This sketch illustrates a concept for placing the I-5 Freeway below grade between the Marquam Bridge and the . It maintains an interchange with I-84 and most, but not all, existing connections to surface streets via an extension of Water Avenue in a c onfiguration POTENTIAL OPENSPACE

LEGEND Water Avenue Arterial similiar to the current . Removal of the freeway would permit Water Avenue to be extended north to connect with t he Rose

Union Pacific Railroad Above ground structures and ramps New local street system Redevelopment sites Bridge structure 0 100 200 N Quarter. The call-out boxes provide additional details on engineering and traffic issues. HEIGHT VARIES MAX Line Below ground tunnels and ramps Local street intersections New connections Portal 114’ 80’ 80’ ESPLANADE CUT AND COVER TUNNEL NEW ARTERIAL (5 LANE) UPRR MAINLINE

MARQUAM BRIDGE I-5 TUNNEL AND SURFACE ARTERIAL ROSE QUARTER • Assumed a fixed vertical elevation point at west abutment of bridge • Separates through traffic from local • High energy use (lighting, E • I-5 returns to the surface before the I-405 interchange • ODOT will require seismic upgrade if grade adjustments and lowering of traffic ventilation) and high operational and G

existing Marquam bridge are necessary to pass underneath the Hawthorne D maintenance costs • Requires relocation of Rose Quarter Transit Center I • Creates open space on riverfront Bridge R which is consistant with long term strategy to support M • Large amounts of excavation B E A • Eliminates present weaving redevelopment of the area • ODOT will require seismic upgrade if present bridge structure is modified and disposal G R E movement and improves safety Q D N I • Connects the Broadway/Weidler couplet to U • Costs of Marquam bridge rehabilitation and profile adjustments are • Complicates connections A R • Extended I-5 closures anticipated R the new Water Avenue M expected to exceed replacement O B during construction • Fixed capacity, not easily widened H B N • Consistent with the assumptions from • New bridge will improve safety and seismic performance T R • Groundwater issues, structure • Requires two di erent construction O the ongoing work with ODOT ID W S I R G • Design exception needed for a steeper approach grade (approx 6%) A buoyancy would have to be methods: cut and the NE Quadrant Plan E

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investigated for tunnel and cover and bored tunnel R E

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• Potential impacts to OMSI north parking lot and G • Provides additional E

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NOTE: buildings - would need further study • Hazardous material and I W

M east-west connections R R R R R R R R R R R R R R R R R R R

ROADWAY PROFILE AND overheight vehicle restrictions R N

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TECHNICAL MEMORANDUM • More study needed to design Water Avenue and configuration

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PROVIDED UNDER SEPARATE COVER in tunnels I-5/I-84 INTERCHANGE L Rose Quarter

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of I-5 SB ramp • Eliminates freeway ramp movements, downtown to northbound I-5/ E

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E • Maintains present connections E T T T T T T T T T T T T T T T T T T T T eastbound I-84 and southbound I-5/westbound I-84 to downtown z T

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D • Maintains HazMat and overheight

• Creates new Stark Street on-ramp to southbound I-5 I

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B • Compatible with N/NE Quadrant

E APPROX Planning D

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550,000 S V A N C O U V E R SQ FT • Maintains present UPRR in place A N R • Adds EB I-84 connection to Central U Eastside (via new arterial) W AT E R AV E N U E B DRAFT DRAFT DRAFT DRAFTW IL L IA M S T T T D S S S V

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