I like the dashboard feature -- when Tiger came out I wrote a quick grep-like widget that showed the rivers I was interested in from phateye. Nothing as polished as yours, though, which looks very professional.
The one issue I noticed is that the flows aren't always reported correctly. Right now, for Ark at Granite, the widget shows 60.1cfs, 15ft stage, which can't be right. The USGS page shows 205 cfs, 3.6ft stage. Attaching a screenshot. Let me know if you have an update or if you'd like me to try something specific.
PS. Ah, I think I see the issue. USGS has site ID 07087050, and you're using 07086000, which seems wrong. The 60.1 is the temp of water in F.