By late 1937, "Arthur Foss" was back in service with a new power steering system and a new, extremely skillful captain. In November both tug and captain, Martin Guchee, were commended for towing the disabled motorship "Eastern Prince" from Yakutat, Alaska, to Seattle in just six days. Captain Guchee was also at the helm when "Arthur Foss" became in involved in the construction of two of the Northwest's most famous landmarks. In 1938, the tug made a long tow from San Francisco with the giant barge "Foss No. 64", which had been used in the construction of the Golden Gate Bridge. "Foss No. 64" was needed up north for the construction of the Tacoma Narrows Bridge which began in September 1938. The bridge was completed in 1940 and, after just a few months in service, collapsed in high winds due to aeroelastic flutter. Students of physics and structural engineering have been studying the infamous event ever since. In January 1939, construction of another famous bridge began on Lake Washington, the Lacey V. Murrow Memorial Bridge connecting Seattle to Mercer Island. Prior to construction, extensive testing of the pontoons' strength and stability occurred over a nine-month period in 1938. An experimental barge approximating the proposed bridge's configuration was anchored in the lake, and the most powerful tug on the West Coast was hired to put it to the test. Captain Guchee took "Arthur Foss" at full speed around and around the test barge, generating four-foot waves and simulating lake conditions in an wind. Engineers and technicians were on hand to take readings. The test barge held, but not satisfied with the amount of stress he was putting it under, Captain Guchee put "Arthur Foss" bow against the barge and "gave her full power". The anchoring system still held. Utilizing the data gathered during this unorthodox experiment and others, the world's first floating highway bridge was completed in 1940. To this day, there are only five similar floating spans in the world, and three are located in Washington State.