Old 04-06-09, 01:47 PM
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**brian**
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I rode over the Brooklyn & Manhattan Bridges on Saturday with my Garmin 305 (with barometric altimeter), and looking at the maps & elevation/distance data in Ascent, came up with these numbers:

BROOKLYN BRIDGE

Manhattan side to tower: 86' rise over .47 mile -> 3.5% average grade
Manhattan side to crest: 100' rise over .63 mile -> 3.0% grade

Brooklyn side to tower: 92' rise over .46 mile -> 3.8% grade
Brooklyn side to crest: 100' rise over .60 mile -> 3.2% grade

MANHATTAN BRIDGE

Brooklyn side to tower: 79' rise over .45 mile -> 3.5%
Brooklyn side to crest: 98' rise over .56 mile -> 3.3%

Manhattan side to tower: 84' rise over .48 mile -> 3.3%
Manhattan side to crest: 106' rise over .66 mile -> 3.0%

The dots in the pics show where I started counting distance & elevation. In each instance, this was more or less the point where the data showed the elevation starting to increase.



If you went out with surveying equipment you'd probably come up with slightly different #s, but this should be a pretty good representation of the grades & distances relative to one another.
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