Over at
there is a good diagram.
The center span over water is 468’ (if I recall correctly) of the 1900’ total.
The whole bridge was limited to one lane each direction where there is normally four lanes of heavy traffic each direction.
Has that been confirmed? Even 2 days later i've heard conflicting accounts, 1/2 those saying 2 lanes were open per direction (4 total), and the other half saying only 1 lane per side(2 total). Could it be the reason for the confusion was that while parts of the collapsed section was down to 2 lanes, others were still at 4?