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Thanks for the ping.

I've criss-crossed that affected area just about every way imaginable, from the southern route, OR-140 Medford-Winnemucca-Wyoming; to the northern Portland-Columbia Gorge-Boise-Great Falls-Jackson run.

My favorite, being that the trips are Medford, OR to the SD Black Hills, is Medford-Klamath Falls via 140, then 97 north & cut across the Klamath Marsh to Silver Lake & Christmas Valley, and over to Burns. From there, south to Jordan Valley & into Idaho, use the west/south side highway to the Bruneau Dunes area before picking up I-84 east of Mountain Home over to Ogden, then up Ogden Canyon into Wyoming, then across on state roads.

Advice: Take along copies of Roadside Geology for each of the states, and make a vacation of the trip itself. Maybe a good guide book to the Oregon Trail, too.

There are some places that are marked concerning the floods from Lake Bonnieville, but I don't remember seeing any for the Lake Missoula Floods.

There is a GOOD interpretive site at the rest stop (first one south of the Idaho/Utah border--not the one at the border!) on I-84 between Snowville and Tremonton, UT concerning Lake Bonnieville & it's floods. Many of the old shoreline shelves, at least four as the lake levels changed, are easily visible all along the surrounding hills in the entire basin.