This is a question that we get asked a lot! J Let us see if we can help clear this up J
It starts with Lake Roosevelt is a reservoir. When full its elevation is 1285 feet or so above sea level. To protect the reservoir the Federal Government bought a strip of land around Lake Roosevelt. This strip of land is 1310 feet above sea level, hence the 1310 line.
The Park Service manages this strip of land as if it were a National Park. This strip of land would be better called the Government line as it is not always 1310 feet about sea level.
If you have additional questions on the 1310 line and property that’s available please let us know.
Len & Carol