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A map where each dot is a bridge:
I find it weird to note the not-so-obvious places without bridges: much of Florida, southeastern Missouri, West Virginia. These aren’t dry places, but I guess that they’re drive around places.
It’s also pretty obvious where the 100th meridian — dividing the flowing water east from drier west — is.
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Florida is limestone karst country, surface water tends to flow underground very quickly. The cavities they create is why they have sinkhole problems. Once you get below the panhandle there aren't very many rivers.
Posted by: Roy | February 21, 2015 at 04:16 PM
It may be more related to road density in the west rather than the density of rivers.
http://kottke.org/13/06/all-of-the-rivers
Posted by: BA | February 22, 2015 at 03:56 PM
Roy: that's an excellent point.
Posted by: Dave Tufte | October 30, 2015 at 03:26 PM
BA: Yes, of course. But the bridge density is determined by roads ... which in the west are mostly near water sources.
If you look closely, the route of I-15 across Utah is sharply defined. This is because it is built hard up against the mountains, that have streams coming out of canyons to be crossed. But there's not much west of that all the way to the Sierra Nevadas ... because there's not much to cross.
Posted by: Dave Tufte | October 30, 2015 at 03:28 PM