HomeMy WebLinkAboutItem Q April 12, 1999
STAFF REPORT
To: Mayor and Members of the City Council
Attention: Keith R. Till, City Manager
From: Stephen G. Badum, Director of Public Works/City Engineer
Subject: MARINA DRIVE BRIDGE REPLACEMENT
BRIDGE TYPE SELECTION REPORT
GENERAL DESCRIPTION:
Receive and File the Structure Type Selection Report for the San Gabriel River Bridge at
Marina Drive, BR. NO. 53C-0029 and authorize the transmittal of a letter supporting the
report recommendations to the Long Beach City Council.
DISCUSSION:
The City's design engineering firm, J. Mueller International (JMI), recently completed the
Structure Type Selection Report for the San Gabriel River Bridge at Marina Drive. In
general, the report makes three primary recommendations as follows:
1) Structure Type—Based upon cost and seismic considerations, the replacement bridge
is recommended to be a cast-in-place/prestressed box girder structure with cast-in-
steel-shell piles.
2) Traffic Lane Configuration—The results of the traffic analysis indicate that the
capacity of the existing four lane bridge exceeds the existing and future projected
traffic volumes. In an effort to reduce costs and improve pedestrian and bicycle safety
it is recommended that the replacement bridge accommodate one traffic lane in each
direction with bicycle lanes and 10' wide sidewalk on the ocean side of the bridge.
3) Construction - Three alternatives were investigated: complete closure during
construction of a new bridge; two phased construction of a new bridge with two lanes
maintained; and two phased construction of a new bridge with one lane maintained.
The report recommends the full closure of the bridge during construction in order to
save over $1,000,000 and shorten the duration of the project construction time by
over one year. The potential savings and reduction of impacts to adjacent residents
and businesses make the one year closure of the bridge the most effective and efficient
alternative. To mitigate any negative impacts to the adjacent businesses, detour
signing which emphasizes that business are open and depicts alternative routes can be
installed on Pacific Coast Highway.
1 AGENDA ITEM (2.
Marina Drive Bridge
City Council Staff Report
April12, 1999
FISCAL IMPACT
The State has committed to funding 88% of the total cost up to $5.7 million. Depending
on the alternative chosen, each City would be responsible for$209,000 to $264,000.
RECOMMENDATION
City staff recommends that City Council receive and file the Structure Type Selection
Report for the San Gabriel River Bridge at Marina Drive, BR. NO. 53C-0029 and
authorize the Mayor to sign a letter supporting the report recommendations to the Long
Beach City Council.
NOTED AND APPROVED
d4
eph- �G. Badum, Director Keith R. Till
Pub c Works Department City Manager
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