This view looks across the river, from north to south, showing the possible drainage Sgt. Nathaniel Pryor and his men pushed the horses up.
Bill Cole and Mike Penfold discuss Clarks Crossing of the Yellowstone River on Thursday. Penfold speculated that the Bozeman Trail may have used the same crossing almost 60 years after William Clark's men.
Ralph Saunders moves through tall grass carrying a GPS and maps of Clarks Crossing of the Yellowstone River near Billings.
The Yellowstone River in the area of Clarks Crossing used to flow farther north in 1806.
Bill Cole, Ralph Saunders and Mike Penfold check a GPS near Clarks Crossing of the Yellowstone River near Billings.
Ralph Saunders talks about the impact of beaver near Clarks Crossing. Back in 1806, there were so many beavers along the Yellowstone River that there were lots fewer trees in the floodplain, Saunders said.
Bill Cole, Mike Penfold and Ralph Saunders discuss where William Clark's men probably crossed the Yellowstone River near Billings in 1806 while herding 26 horses.
They went to Sioux Falls, S.D., and liked virtually everything they saw.
The Billings Chamber of Commerce has announced its 2014-2015 board of directors, effective July 1, 2014, through June 30, 2015.
The city of Billings is considering leasing a 71-acre parcel of land along the Yellowstone River from the state of Montana.
From left, Cole, Jeff Butcher and Chas Weldon examine a map from 1881 showing the path of the Northern Pacific Railroad through the Yellowstone Valley.
Bill Cole, Jeff Butcher and Chas Weldon, left to right, look at an Official Map of the Fort Laramie Treaty, dating from 1851. The map includes a small portrait of a Crow Indian chief identified as “Big Robber.”
Measuring chains once used by surveyors are part of the “Charting the New Frontier” exhibit.
A detail of an 1897 General Land Office map of Montana notes where coal is found or likely to be found.
A 1927 Montana AAA map shows a then-rare section of paved road between Butte and Anaconda.
Bill Cole shows an early French map of the western United States. Cole lent the Yellowstone County Museum several original maps for its “Charting the New Frontier” exhibit.
The exhibit “Charting the New Frontier” is now on display at the Yellowstone County Museum.
A Rand McNally map of Montana in 1879 includes descriptions of what were then walking paths between the Bull Mountains and the Yellowstone River.