Currently, the walkway on the Camden end of the bridge ends in a steep staircase with 39 steps. The Philadelphia side has a gently ascending sidewalk that leads to the walkway.
One of the three alternatives would be similar to the Philadelphia side, with a ramp that would follow the roadway to the ground at Fifth Street.
That would be the most expensive option, estimated to cost $3.7 million, DRPA engineer Dan Cosgrove said.
The other two options call for zigzag ramps, with intermediate landings, to get pedestrians to the ground.
One, with three switchbacks, would cost about $3.1 million, while the second, with one switchback, would cost about $3.0 million.
An additional $1 million could be required, with any of the alternatives, to widen a 600-foot-long "cattle chute" where the existing walkway narrows from 10 feet to five feet.
Meetings will be scheduled with interested groups and the general public before a final design decision is made, DRPA Chairman David Simon said.
Once a design is selected, construction could begin next year or in 2015.
With any of the alternatives, lighting would need to be improved, because the current lights are too dim to meet modern standards, Cosgrove said.
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