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Bridge Concepts |
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The Sellwood Bridge team has made the first attempt at creating some concepts for
rehabilitation and replacement of the Sellwood Bridge. Like a jigsaw puzzle, there
are three parts that need to be fit together: the
alignment, the interchange/intersection,
and the width. Depending upon how
these pieces are put together, there are potentially many different bridge concepts.
Based on what the project team heard from the public, several
new alignments are shown below; including a tunnel.
The next step will be to measure the concepts against the criteria in the Evaluation Framework.
If a concept doesn't meet the Purpose
and Need of the project, it will be eliminated. Your input, along with
technical analysis, will help to narrow the range of alternatives to a few that
will be studied in detail in the
Environmental Impact Statement (Draft EIS).
After the Draft EIS is completed, the preferred alternative will be selected.
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Four new alignments (three north of the existing bridge and one to the
south) as well as the existing alignment are being considered. Click on the colors below to learn more
about each alignment option.
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Several other alignments were suggested to the project team during the public workshop,
through the second survey, and comments
submitted online. Click on the colors below to learn more about each alignment option.
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Begins at Tacoma Street and 6th Avenue on the east, extends north along Oaks Park
Way, crossing through the Sellwood Riverfront Park to connect with Taylors Ferry
Road on the west.
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Click on either of the pictures below to see a larger PDF version. |
Detail of Gold Alignment |
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Click on the picture below to look at the alignment
widths and eastside impacts.
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Bridge Widths and Eastside Impacts
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Begins at Tacoma Street and 6th Avenue on the east, extends north along Oaks Park
Way, crossing through the Sellwood Riverfront Park to connect with Highway 43 on
the west, north of the existing bridge.
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Click on either of the pictures below to see a larger PDF version. |
Signalized Interchange |
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Click on the picture below to look at the alignment
widths and eastside impacts. |
Bridge Widths and Eastside Impacts
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Begins at Tacoma Street and 6th Avenue on the east, extends south along Umatilla
Street, and connects to Highway 43 on the west, south of the existing bridge and
Powers Marine Park.
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Click on either of the pictures below to see a larger PDF version. |
Signalized Intersection |
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Click on the picture below to look at the alignment
widths and eastside impacts. |
Bridge Widths and Eastside Impacts
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A tunnel alignment was suggested by the public. The project team created a proposed tunnel location based on several requirements, including
the angle of the road needed to get to the correct depth below the river and connection to existing streets on the east and west sides
of the river. The topography (hills) on the west side were also a consideration.
Begins at Tacoma Street and 16th Avenue on the east and connects to Taylors Ferry
Road on the west.
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Click on the picture below to see a larger PDF version. |
Tunnel Alignment
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Click on the picture below to look at the tunnel alignment crossview and required depths. |
Tunnel Crossview
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Two interchange options are under consideration, one that includes a traffic signal and one that is "free-flow" without a
traffic signal. Both have two levels like the existing interchange. Either one can be used with all of the new alignments and
with all the bridge rehabilitation and replacement options.
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Non-Signalized Interchange
This interchange has free-flowing traffic with bridge traffic traveling on a looped on and off ramp. Highway 43 would be located below
the on and off ramps. Bicyclists and pedestrians would use switchback ramps and a path that runs next to highway 43 to access west side
destinations.
To view how this interchange looks with the five alignments, select the alignment color below:
green
orange
blue
yellow
purple
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Signalized Interchange
This interchange stops traffic with a signal before getting on and off the bridge. Highway 43 would be located below the on and off ramps.
Bicyclists and pedestrians would use switchback ramps and signalized crosswalks to access west side destinations.
To view how this interchange looks with the five alignments, select the alignment color below:
green
orange
blue
yellow
purple
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There are almost 50 different potential combinations of vehicle lanes, flex lanes for transit, bicycle lanes,
shoulders, and sidewalks. The tradeoffs among a range of bridge widths—from 31 to 92 feet—are being
evaluated. The 2-lane options are consistent with the Tacoma Street Plan and Regional Transportation Plan.
Wider structures would offer flexibility for more extensive bicycle and pedestrian facilities and additional
multi-modal capacity, including streetcar or express transit. A wider bridge also would allow emergency vehicles
to cross the river faster during periods of heavy traffic.
Each bridge width option provides opportunities for different cross-sections. Click on the cross-sections below to see the
complete set of cross-section examples that were shown during the April 4, 2007 workshop.
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Read more about each proposed bridge width by clicking on the words below.
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31 feet wide
This
is the current width of the Sellwood Bridge. In this 31-foot width option, a 14-foot
shared use path would be placed underneath the bridge deck. This width would only
be used with a rehabilitation concept on the yellow alignment.
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53 feet wide
If the existing bridge is rehabilitated, the maximum width would be limited to 53 feet. The steel structure that
supports the deck (truss) would be re-used, and cannot support anything wider. This option maintains two travel lanes
and adds wider bicycle/pedestrian paths. This 53-foot rehabilitation option would only be used on the yellow alignment.
A new bridge could also be constructed in a 53-foot width on any of the five alignments
(green, orange,
blue, yellow,
purple, gold,
teal, pink,
and burgundy).
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68 feet wide
A 68-foot bridge width is about the same width as the Broadway Bridge. This width could be used with all five alignments
(green, orange,
blue, yellow,
purple, gold,
teal, pink,
and burgundy).
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80 feet wide
An 80-foot wide bridge is about the same width as the Burnside Bridge. This width could be used with all five alignments
(green, orange,
blue, yellow,
purple, gold,
teal, pink,
and burgundy).
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92 feet wide
A 92-foot wide bridge is about the same width as the Morrison Bridge. This width could be used with all nine alignments
(green, orange,
blue, yellow,
purple, gold,
teal, pink,
and burgundy).
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