East End Bridge Design Alternatives
During Step Three of the Bridge Type Selection Process, the East End Bridge team
presented six alternatives to key stakeholders and the general public. At the end
of this step, the six bridge type alternatives were narrowed to three. Feedback
from the public and the Advisory Team was used, along with other factors, to determine
which three bridge types would move forward to Step 4.
The six bridge type alternatives that were considered in Step Three represented
a variety of features, from a low, open profile approach, to a more visually prominent
structure. This mixture reflected the full range of comments received from members
of the AAT/RAC and the general public.
Alternative A1 - Basket Handle Arch
This design consists of two center arch-shaped support beams with support cables
that extend from the center arch on both sides and attach to the outside of the
deck. The curved structure offers high resistance to external pressures.
Alternative A2 - Cable-Stayed "A" Tower
The design for Alternative A2 features two "A" - shaped towers. Support cables extend
diagonally on either side of the structure's two towers and attach to the outside
of the deck.
Alternative A3 - Cable-Stayed "Diamond" Tower
This alternative features two diamond-shaped support towers with cables that extend
diagonally from either side of both towers and attach to the outside of the deck.
Alternative A4 - Cable-Stayed "Single" Tower
This design presents a long, thin profile with two towers rising from the center
of the bridge deck. Cables extend diagonally from either side of both towers and
attach to the outside of the deck.
Alternative A5 - Minimized Cable-Stayed
This option, ultimately the chosen bridge type, features a narrower deck than the
other alternatives, with two thin towers rising from the center of the structure.
Cables extend diagonally from either side of both towers and attach to the center
of the deck.
Alternative A6 - Suspension/Cable-Stayed
A hybrid of the cable-stayed and suspension bridge styles, this alternative features
a suspension cable draped over two thin, center towers. Cables extend to the deck
both diagonally and perpendicularly and attach to the center of the bridge.
Pedestrian View
The left pedestrian perspective shows a view running the length of the
bridge from its walkway. The bottom view presents a view of the support
tower from the pedestrian walkway. Roll over the numbers below to see
pedestrian views of each alternative.
Click here to go to the top of the page.
Driver's View
You can view each alternative from the perspective of a driver crossing the
bridge. Roll over the numbers below to see a still view from each
alternative, or click on them to run the driver's view simulation. NOTE -
You will need QuickTime
installed on your computer to view this simulation.
Click here to go to the top of the page.
Alternative Issues Chart
The Bridge Alternative Comparison Chart allows you to compare construction
costs, construction impacts, and maintenance factors for each alternative.
Please click here to view the
chart.