SR-012766Q i~ r ~"
CITY OP SANTA MONICA ~ ~""{°..~ ~ ``
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INTER-DEPARTMENT MEMO ~
DATE: January 27, 1866
TO: Perry Scott, City Manager
FROM: Bartlett L. Kennedy, City Engineer
SUBJECT: Right Turns From Pacific Coast Highway to California Incline
In compliance with your verbal request, this office has
conducted a study to determine if there is a feasible way
to provide for a right turn movement from the northbound
Pacific Coast Highway to the California Incline.
This study, which is necessitated by the excessive distance
between the last westbound freeway off-ramp at 11th Street
and the next exit at Santa Monica Canyon, has included not
only the above movement but also all possible methods of
providing another connection between the Coast Highway and
Ocean Avenue between the above two limits.
Following are the results of said study:
1} Right Turn from Coast Highway to California Incline.
a sketcri sriowin~ the above inter-
section and the turning path required for the average
vehicle to make such a turn. As shown, said turn
would have to start in the number 2 lane of the Coast
Highway and the front bumper would pass over the
centerline of the California Incline. The Vehicle
Code prohibits a right turn from other than the ex-
treme right lane; therefore, under existing conditions
such a turn would not be legally possible.
The problem would not be solved by cutting back the
curb and wall at the south end of the intersection,
since the angle between the two streets is so acute
that before an acceptable turning radius could be
achieved the grade differential would make a right
turn impossible.
2} Enlargement of Intersection of Coast Highway and
California Incline.
To permit a legal right turn onto the Incline
(i.e., from the right hand lane of the Highway}
would require that the Incline roadvaay be widened a
minimum of 15 feet into the bluff, from a-point
approximately 60 feet north of the south end o.f.
January 27, lg6'o
Subject: Right Turns From Pacific Coast
Highway to California Incline
the retaining wall shown on
distance of 100 feet southe
bound roadway of sufficient
lanes of nor„gal traffic and
rains when stones and earth
face.
Page 2.
sketch a minimum
to provide a north-
th to accommodate- two
lane of traffic during
washed off the bluff
the
"ly,
wid
one
are
The bluff at this point is approximately 100 feet
high. In order to obtain a stable slope, it would
be necessary to construct a-much flatter slope than
presently exists; hence, considerably more than 15
feet of park area would be required at the top of
the cut. No realistic estimate of cost for this work
can be prepared without soils investigation by a
foundation engineer to determine the degree of slope
required; however, I would predict that such a project
would cost considerably in excess of $100,000.
3) U-Turn Grade Separation - Coast Highway, North of
Tunnel.
I-n lgo3 a study was made of the feasibility of a
proposed "U-Turn Grade Separation Structure" prepared
by Mr. James Mount, a member of the Causeway-Freeway
Commission. This structure, as the title states,
would provide a grade separation structure that would
permit a northbound vehicle to leave the Highway, make
a U-Turn over the Highway, and return to the High+vay
in a southbound direction. Such a structure, located
near the prolongation of .Santa Monica Boulevard, would
permit a motorist who missed the 11th Street off-ramp
to return to the City via the eastbound Lincoln Boule-
vard off-ramp.
This 1903 study, which was presented to the City
Council at its meeting of November 12, 1963 (Item 8-G ),
indicated an estimated cost of $450,000 for such a
structure.. This high estimated-cost is due to the
following factors;
a) Value of property required for acceleration
lane on seaward side. This lane would be
required since the State would not permit any
reduction in the width or number of roadway
lanes.
January 27, 1960 page 3.
Subject: Right Turns From Pacific Coast
Highway to California Incline
b) Extensive structures required (cost based on
Division of Highways experience).
This structure would require excavating back into the
bluff to provide space for the deceleration lane.
This would require a certain amount of park and path
reconstruction and relocation.
Construction of this project would of course require
State approval. Such approval would be contingent,
among other things, on the St ate~s plans for the
extension of the Santa Monica Freeway.
Transmitted herewith is a sketch showing a plan and
cross section of such a structure.
~+ ) New
o Carry Northbound
vicean avenue.
Topographic conditions
Several design control
hered to; for example,
roadway to enter Ocean
roadway to enter Ocean
Avenue.
to
make such a roadway impractical.
features would have to be ad-
an 8% maximum roadway grade;
Avenue at existing intersection;
Avenue at right angles to Ocean
The grade differential between the Coast Highway and
Ocean Avenue is such that the above conditions cannot
be met by a new roadway. only one block in length. The
following potential locations for a two block long
Incline were studied:
a) Leave Coast Hightivay at end of Broadway, enter
Ocean Avenue at Arizona Avenue.
b) Leave Coast Highway at end of Santa Monica
Boulevard, enter Ocean Avenue at Wilshire
Boulevard.
Both of the above would require the removal of
the existing Arizona Avenue pedestrian overpass.
c) Leave Coast Highway at end of Arizona Avenue,
enter Ocean Avenue at California Avenue.
This would create an extremely hazardous inter-
section with the existing California Incline.
January 27, 1966 Page 4,
Subject: Right Turns From Pacific Coast
Highway to California Incline
The California Incline itself, and the "Sorrento"
property beyond, prevent such a roadway being built
further north than (c) above.
No estimates have been prepared on any of the above.
A realistic estimate cannot be prepared without
expenditure of considerable time, and would probably
require the services of a consulting structural
engineer. It can be assumed, however, that the cost
will exceed the cost of the U-Turn structure described
in (3) above.
All of the above :may be summarized as follows:
1) Aright turn from the Coast Highway to the California
Incline is impractical and illegal under existing
conditions.
The desired movement can be achieved by various con-
struction methods, as follows:
2) Enlarge lower end of California Incline.
3) Construct U-Turn Structure at Broadway.
4) Construct new Incline to Carry Northbound Coast
Highway Traffic to Ocean Avenue.
No estimates of the cost of (2) and (4} have been prepared
but it may be assumed that such costs will be considerable.
The estimated cost of (3} is X450,000.
I will await further instructions from your office before
proceeding further with this matter.
a ~'~~~--
BARTLETT L. KENNEDY>
City Engineer
BLK:fs
Attachments: Sketches
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