[ambiate]

Richland Chambers Reservoir shows up as "Corsicana River" on terrain data. I asked around and was told that 20+ years ago that was the name of the river before they broke a dam and extended the area. Perhaps the data being used to map terrain areas is quite old?

[trafficlight]

I know that the Montana topographic quads are based off of surveys done in the 60s and 70s. A lot of them have been updated, but the names don't always get changed.