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name of Alex
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This came to my inbox via River Network Partners, there's work underway to change culverts so they aren't barriers to the upstream movement of fish and other animals:

One of the most unforeseen danger to the biodiversity in our river networks is habitat fragmentation through un-passable culverts throughout the United States. While blockages via dams number upward of 100,000 or so, the blockages created by ecologically and biologically inefficient culverts is likely to number in the millions. The majority of these culverts are located in headwater areas of rivers, which entail greater than 50% of most river miles in a watershed; a large cumulative impact. As a result, native key headwater species such as brook trout (Salvelinus fontinalis) in the East and cutthroat trout (Oncorhynchus clarkii) in the West have had their historic ranges reduced to a fraction of their former extent.
http://www.princetonhydro.com/blog/...lutions/?goback=.gde_1183877_member_256698706
 
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