The early 1900s was the "Golden Age of Postcards", with the "Penny Postcard" being a popular way to send greetings to family and friends. Penny Postcards today show us a snapshot of history, as seen in these views along the Columbia River. The trail follows that of Lewis and Clark from the Tri-Cities of Pasco, Kennewick, and Richland, Sacajawea State Park at the mouth of the Snake River, down the Columbia to end at Cape Disappointment, Astoria, and Seaside and the Pacific Ocean. Click on each thumbnail to enlarge the card, or click on the "advance arrows" to learn more about the area and see what it looks like today. Please do not download these images without permission. Note -- this section is always being added to, please check again later. Dating these postcards -- the generally accepted postcard guideline which I followed here is, "Pioneer Era" preceeded the "Private Mailing Card", popular between 1898 and 1901, "Undivided Back" cards were 1901 through 1907, "Divided Back" cards began in 1907 through 1915, "White Border" began in 1915 and continued to 1930, "Linen" cards were popular in the 1930s and continued through about 1945, and "Chrome" began in 1939 and continues today. "Real Photo" cards were first introduced around 1900. One cent postage was from 1872 to 1917 when it went to 2 cents. In 1917 postage went back to 1 cent and continued until 1952, when once again it went to 2 cents. If a copyrighted date was on the card, that was used. If a postmark was on the card that was considered.