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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