Whitcomb. Also operating on the river at this time were James P. Flint, Allen, Washington, and the small steam vessels Eagle, Black Hawk, and Hoosier, the first two being iron-hulled and driven by propellers. Canal and locks at Willamette Falls Locks were completed at Willamette Falls in 1873. This eliminated the need for the portage at Willamette Falls and established an "open river" all the way south to Eugene, although the water was so shallow by that point that few boats ever made it so far. Lock and dam on Yamhill River In 1900 a Yamhill River lock and dam lock and dam was completed about 1.5 miles downriver from Lafayette, Oregon. The lock was decommissioned in 1954. The dam was deliberately destroyed in 1963 to allow better passage for salmon on the river. The site of the lock and dam is now a county park. Operations on Willamette River The Willamette River was readily navigable by steamboats all the way up to Milwaukie. Above Milwaukie, there were two barriers to navigation, the Clackamas Rapids and Willamette Falls. The Clackamas Rapids were navigable, provided the steamboat was small and light. Willamette Falls was impassable. All traffic bound upriver had to portage around Willamette Falls at Oregon City. Steam powered vessels did not operate on the Willamette River above Willamette Falls until 1851. Other than the small Hoosier, a converted ship's long boat with a pile driver engine, the first boat on the Willamette above the falls was the Canemah, built at the town of the same name and launched towards the end of September, 1851. Her owner was Absalom F. Hedges, the founder of Canemah. Canemah proved to be a profitable boat, she got the contract for carrying mail upriver, and earned 20 cents a bushel hauling grain downriver from Corvallis to Canemah. A boat of her size could load 1,000 to 1,500 bushels a trip. Multnomah, prefabricated back east and shipped out to Oregon, was apparently assembled at Canemah and launched about the same time as the steamer Canemah. She operated on the Willamette and also on the Yamhill River as far up as Dayton. Multnomah's draft was too deep for the upper stretches of the Willamette (where the real money could be made hauling cargo) and so in May 1852, she was portaged over the falls to operate in the lower Willamette and Columbia rivers. Operations on tributaries