Surfing over to the New England Corps of Engineers site here to gain statistics for the river you get this rather ironic message. "Bad Gateway. The proxy server received an invalid response from an upstream server." So, the error message tells you what is wrong with the network, but also what is wrong with the flood gateways upstream.
Network World thinks the NECE site was just flooded with traffic. Certainly the engineers can't be bothered fixing it as the error has been up for a couple days now. ยต