Collection consists of 12 black and white photographs, primarily of buildings and grounds at he 1905 Lewis and Clark Exposition in Portland, Oregon, as well as a few images of unidentified visitors to the exposition.

Lars Christensen Henrichsen (1839-1924) was a Portland jeweler and photographer. This collection is made up primarily of glass plate negative photographs taken by or attributed to Henrichsen between 1895 and 1910. Primary subjects depicted in the collection include the Portland skyline, Mount St. Helens, Mount Hood, the Lewis and Clark Centennial Exposition, the Oregon Coast, and the Columbia River Gorge.