Water Quality (BOD/COD) data of major U.S. Rivers

[somethingwitty]

I'm trying to find a table listing BOD and COD values for various rivers in the U.S. I know it's out there somewhere, and I think I'm close - so far, I've checked out various sections of the USGS site as well as some environmental sites, but no luck with a table summarizing the values for different rivers.

Anyone got any other links to try? An actual link to the data I'm looking for?

thanks in advance...