I’ve just learned from Salle E. that something is wrong with Hebgen Dam near West Yellowstone and the area downstream is being evacuated due to flooding flows of the Madison River.
I see nothing on-line yet.
Update. Here is a news story. It looks like a gate is stuck open and a lot of water is flowing into the reservoir from heavy thunderstorms.
Link to Heben/Quake Lake area Google Maps
Update. Sunday. Sept. 7. Apparently this is still not fixed. Engineers are fashioning some steel “bulkheads” and so plug the headgates that became stuck open. Last week they were removing concrete from the water intake tower. After that the bulkhead will be lowered down. I believe the Madison River flows are still about 4 times normal for this time of year.