Tammany Bar Flood Deposits

Tammany Bar Floods Deposits

NPS

Quick Facts

OPEN TO PUBLIC:

No

MANAGED BY:

Private

South of Lewiston, Idaho, in the Tammany Bar area, there are private gravel quarries in coarse gravel terraces, which were formed by the Bonneville Flood, which happened in ~11months, sometime around 18.,500-17,400 years ago. Capping the gravels are rhythmites of sand and silt from the Missoula Floods.