Ok, Googled it. Yep, high demand for lumber during WWII. I bet our friend the NWP was busy.
"World War II caused heavy inroads on the Nation's forests, as wood became a critical war material needed for barracks and cantonments, ships and docks, war plants and war housing, gun stocks,explosives, airplanes, boxes and crates for war supplies, and hundreds of other essential uses. The Armed Forces used a greater tonnage of wood than of steel."
"Many peace time activities were curtailed, such as the nationwide forest survey, reforestation work, and land acquisition under the Weeks law."
From: [
foresthistory.org]