This southernmost crossing of the canal is another two-for-one bridge, with the Gowanus Expressway
on the upper viaduct and the Hamilton Avenue bascule drawbridge directly below it. The drawbridge contains
two separate parallel spans (one for eastbound, one for westbound - NYC BIN #2240231/2). This
has been a very popular crossing point since the canal was a creek and a number of different bridges
have been built here since the mid 19th century, including bascule bridges in 1905 and 1942.
It was renovated around 2005, although I'm not sure how much of the 1905/1942 bridge (if any) was
incorporated into the renovation.