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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.


It may be more related to road density in the west rather than the density of rivers.

Dave Tufte

Roy: that's an excellent point.

Dave Tufte

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.

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