O & C lands
Much of the land Guido identified in that checkerboard pattern are O & C lands - lands once given by the federal government to the Oregon and California Railroad for disposal to individuals. Instead, they cut as much timber as they could and gave it back to the government. For decades these lands were intensely managed for the maximum sustained timber yield, but the Endangered Species Act and the spotted owl slowed the rate of harvest considerably. Sadly, the entire Oregon Congressional delegation, concerned about declines in county revenues (counties share in the payout from timber sales) and employment are screaming to change management, in large measure, by circumventing species surveys. The chance of trading these lands for more valuable riparian lands is very low. Ironically, increasing harvest on such lands might increase their value and increase the opportunities for such exchanges, but that's mere idle speculation.