In reply to: [tz] Idaho tz correction Ian Abbott abbotti at mev.co.uk Tue May 22 11:12:18 UTC 2012 .... I guess we'd want to change the comment for Southern Idaho (America/Boise) as well, replacing "the southern quarter of Idaho county" with "the part of Idaho county lying south of the Salmon River".) Though looking at the map, the river meanders a bit so that some of the portion described above as lying south of the Salmon River is actually north of part of the river and south of another part of the same river! Reply: The law says that the "main channel of the Salmon River" the boundary is. US Code of Federal Regulations, Title 49 (Transportation), Subtitle A (Office of the Secretary of Transportation), Part 71 (Standard Time Zone Boundaries). See paragraph 71.9. Oscar van Vlijmen