Background – Existing ConditionsBackground – Existing ConditionsBackground – Existing ConditionsBackground – Existing Conditions

Light Damage Moderate to Severe DamageModerate Damage Severe Damage

Alkali Silica Reaction (ASR) deterioration is throughout structure

Past repairs have been ineffective and ASR will continue

Seismic reliability is poor, with high collapse probability

Viaduct geometrics are functionally deficient

L.A.

R I V E R

MA

TEO

ST .

IMPER

IAL ST.

AVE.

MESQ

UIT ST.

RD.

UPR

R

SCR

RA

(METR

OLIN

K)

SCR

RA

(METR

OLIN

K)

BN

SF RA

ILWA

Y INC

.

LAC

MTA

(METR

O_)

SAN

TA FE

JESSE ST.

MISSIO

N CLARENCE ST.

ANDERSON

ST.

6THST.

6TH ST. Existing Viaduct

Alignment 3BNO SCALE

N

Preferred AlternativePreferred AlternativePreferred AlternativePreferred Alternative

ReplacementReplacementAlignment 3B Alignment 3B

Bridge Concept - Type 4Bridge Concept - Type 4

$401M$401M