Using LIDAR (light detection and ranging), INA researchers were able to obtain more than 160 million data points on the 1908 sternwheeler Evelyn.
The Evelyn (renamed Norcom) was originally a U.S. registered, wooden-hulled stern wheel steamboat built at St. Michael, Alaska in 1908 by Bratnobar for the Upper Tanana Trading Company. Her hull measured 39.6 meters by 8.7 meters with a depth of 1.28 meters. The vessel was powered by two horizontal, high pressure cylinders. At some point the ship was sold to the Northern Navigation Company- it wrecked in the Tanana River. Her machinery was removed & taken to St. Michael where a new hull was built. She was converted to Canadian registry in 1913, & then owned by the British Yukon Navigation Co. in 1919. She was beached on Shipyard Island & her engines installed in the Steamer Keno in 1922. Registration was cancelled in 1931.
The ship now lies on blocks at a once important (now abandoned) shipyard & wintering area between Dawson City & Whitehorse, at the base of the Thirty Mile Section of the Yukon River. One boiler & smokestack remain- the rest of the machinery has been removed. The paddlewheel axle, flanges, & crank lie near the ship. While the upper superstructure is largely collapsed, the hull & freight deck are intact. The three tiller-rudder assemblies are complete- they still work.
The LIDAR Survey
The mission of the Yukon River Survey was to locate/document historic Yukon River shipwrecks & hulls. Canada's Yukon Territories contains more accessible early sternwheelers than anywhere else in North America. Approximately 290 sternwheelers once plied the Yukon River, of which 110 were built in 1898 in response to the Klondike Gold Rush. Unlike broken fragments found in the Mississippi or Columbia River systems, the Yukon's steamer wrecks are intact to the point you can walk their decks, swing their tillers, watch their rudders turn. A July 2007 project marked the beginning of detailed documentation in the Yukon. In the first phase, an INA team & EPICSCAN staff spent five days at Shipyard Island, 60 km from the nearest road, & LIDAR-surveyed the 39.6 meter 1908 wooden-hulled sternwheeler Evelyn. The result was a data "cloud" of millions of highly accurate survey shots inside & outside of the vessel, such that features down to 3 mm in width were recorded. The 3-D model shows all timbers & planking. It can be cross-sectioned as required.
The image quality of the animation below has been reduced for online viewing.
Reduction was done by EPICSCAN:
(courtesy of inadiscover.com)
Undated photograph of the Evelyn (Norcom)