I have a biased view on this (I briefly biked competitively), so take it with a mild grain of salt, but it's pretty much fine if you can be an assertive cyclist

I have a biased view on this (I briefly biked competitively), so take it with a mild grain of salt, but it's pretty much fine if you can be an assertive cyclist. Some of the bridges you have to be very assertive about owning your lane -- particularly the highland park bridge, to get to areas north/northeast of the city. From downtown to the north side, there are several bike-friendly bridges: The Clemente, Warhol, and Rachel Carson bridges all have sidewalks. To the south side, the Smithfield bridge has a very large (and very popular) sidewalk, and the newly renovated Hot Metal bridge has a dedicated bike span.