The Bridge can be a dense, difficult poem, even for folks who are aware of its complexities. I have put together a very brief bibliography to help you get started.
The Bridge by Hart Crane
The Annotated Edition, Edited by Lawrence Kramer
Published by Fordham University, 2011.
This book is a must! Bound to become a true classic for The Bridge. When I first read this poem, while studying for my baccalaureate at Iona College, under Professor Porter, our Professor basically went through the poem, one line at a time. Unfortunately, I no longer have those notes. This book is as close as you can come. An absolute must.
Hart Crane An Introduction And Interpretation
by Samuel Hazo
Published by Holt, Rinehart, Winston, 1963, paperback.
This paperback written in 1963, is both a good general introduction and a good reference on The Bridge. There are two long chapters on the poem, comprising almost half the book.
Modern Critical Views
edited and with introduction by Harold Bloom.
Published by Chelsea House Publishers, 1986.
This is from the Bloom series, a general collection on Hart Crane and his works, with at least two specific essays on The Bridge.
Please let me know if you have any other sources and I will keep this posting updated.