HomeMy WebLinkAboutMINUTES - 06041991 - 2.1 (2) TO: BOARD OF SUPERVISORS
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FROM: Harvey Bragdon, o'/" C�lJC1la
Director of Community Development ..
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DATE: June 4, 1991
SUBJECT: Report on Cummings Skyway Extension
, SPECIFIC REQUEST(S) OR RECOMMENDATIONS) & BACKGROUND AND JUSTIFICATION
RECOMMENDATIONS
Accept report from the Director of Community Development on the
extension of Cummings Skyway.
FISCAL IMPACT
None
BACKGROUND/REASONS FOR RECOMMENDATIONS
In response to Supervisor Fanden's April 23, 1991 request the
following report on the extension of Cummings. Skyway has been
prepared.
Cummings Skyway is a two lane roadway located in western Contra
Costa County which extends from State Route 4 northerly to
Interstate 80. Cummings Skyway was built in 1958 to serve as a
connection between the two highways and serve as a secondary
entrance to the Town of Crockett.
The extension of Cummings Skyway from its terminus on the westside
of Interstate 80 to San Pablo Avenue (old Highway 40) has been
identified in the Transportation and Circulation Element of the
adopted County General Plan. The purpose of this roadway extension
is to provide a new access route to Interstate 80, principally for
trucks serving nearby industries. Extension of the roadway would
reduce truck traffic on Parker Avenue in Rodeo and San Pablo Avenue
in Crockett, and re-direct some regional thru-traffic back onto
Interstate 80 which now uses San Pablo Avenue as a bypass route. In
addition, . should BART be extended to Crockett, the Cummings Skyway ,
extension could become an important access road, if a station was
to be located either at the junction of Interstate 80 and Cummings
Skyway or near the Selby railroad junction.
CONTINUED ON ATTACHMENT: X YES SIGNATURE
RECOMMENDATION OF COUNTY ADMINISTRATOR RECOMMENDATION OF OARD COMMITTEE
APPROVE OTHER
SIGNATURE(S) :
ACTION OF. BOARD ON ,Tune 4, 1991 APPROVED AS RECOMMENDED x OTHER
VOTE OF SUPERVISORS
I HEREBY CERTIFY THAT THIS IS A
x UNANIMOUS (ABSENT IV TRUE AND CORRECT COPY OF AN
AYES: NOES: ACTION TAKEN AND ENTERED ON THE
ABSENT: . ABSTAIN: MINUTES OF THE BOARD OF
SUPERVISORS ON THE DATE SHOWN.
Orig: Community Development Department ATTESTED /99/
cc: Public Works Department PHA BATCHELOR, CLERK OF
County Administrator THE BOARD OF SUPERVISORS
AND COUNTY ADMINISTRATOR
BY , DEPUTY
S
The Public Works Department conducted a study of alignment alternatives for the .
extension of Cummings Skyway in July, 1990. Two alignments were studied in
detail, they were:
I. Extend the road southwest of the Selby Reservoir and along
the side of the hill which slopes down to the southwest from
the Selby Reservoir to Wickland oil tank farm and connect to
San Pablo Avenue approximately 100 feet to the north of Old
Country Road.
II. Extend the road around Selby Reservoir to the northeast and
continue down connecting to San Pablo Avenue approximately
1500 feet to the north of Old Country Road.
Both of these alignments are shown in Exhibit 1.
The alignments were examined according to cost, design speed, maximum grades,
earthwork, and right of way detail. Each route begins at the existing dead end
of Cummings Skyway at Interstate 80 and will connect to San Pablo Avenue at a 'IV
intersection. Several variations of alignments I & II were screened and analyzed.
The routes depicted in Exhibit 1. represent the final alignments selected for
study purposes. The following table presents a summary comparison of these two.
alignments:
ALIGNMENT TOTAL EARTHWORK (CY) MIN MAX RIGHT OF WAY
COST EST. CUT FILL DESIGN GRADE NEEDED
ALTERNATIVE { $ 1990 ) SPEED
I $5,331, 000 616, 000 450 MPH 8% 21.8 ac
498, 500
II $4,550, 000 476,800 ♦45 MPH 6% 13.2 ac
253,500 + House
46 Due to vertical alignment
4 Due to 700' horizontal curve
Alternative II was identified as the preferred alignment based on lower cost,
less earthwork, and reduced right of way acquisition. Also, given that the road
extension would be heavily used by trucks, the 6% grade on II is a key factor in
its favor. Another factor to consider in choosing an alignment is aesthetics.
Alternative I traverses within 100 feet of an oil tank farm, whereas II is more
scenic travelling around a hill and down into a small valley.
A funding source for the Cummings Skyway extension has not yet been identified.
EXHIBIT 1
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• ROUTE II
PREFERRED ROUTE
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