originally entirely "Rawlins Red". Deck To provide sufficient clearance for shipping in the East River, the Brooklyn Bridge incorporates long approach viaducts on either end to raise it from low ground on both shores. Including approaches, the Brooklyn Bridge is a total of long when measured between the curbs at Park Row in Manhattan and Sands Street in Brooklyn. A separate measurement of is sometimes given; this is the distance from the curb at Centre Street in Manhattan. Suspension span The main span between the two suspension towers is long and wide. The bridge "elongates and contracts between the extremes of temperature from 14 to 16 inches". Navigational clearance is above mean high water (MHW). A 1909 Engineering Magazine article said that, at the center of the span, the height above MHW could fluctuate by more than due to temperature and traffic loads, while more rigid spans had a lower maximum deflection. The side spans, between each suspension tower and each side's suspension anchorages, are long. At the time of construction, engineers had not yet discovered the aerodynamics of bridge construction, and bridge designs were not tested in wind tunnels. It was coincidental that the open truss structure supporting the deck is, by its nature, subject to fewer aerodynamic problems. This is because John Roebling designed the Brooklyn Bridge's truss system to be six to eight times as strong as he thought it needed to be. However, due to a supplier's fraudulent substitution of inferior-quality cable in the initial construction, the bridge was reappraised at the time as being only four times as strong as necessary. The main span and side spans are supported by a structure containing six trusses running parallel to the roadway, each of which is deep. The trusses allow the Brooklyn Bridge to hold a total load of , a design consideration from when it originally carried heavier elevated trains. These trusses are held up by suspender ropes, which hang downward from each of the four main cables. Crossbeams run between the trusses at the top, and diagonal and vertical stiffening beams run on the outside and inside of each roadway. An elevated pedestrian-only promenade runs in between the two roadways and above them. It typically runs below the level of the crossbeams, except at the areas surrounding each tower. Here, the promenade rises to just above the level of the crossbeams, connecting to a balcony