Men stand in the pit below the Evans hydraulic elevator system on the lower Swan River, southwest of Swan's Nest, north of Breckenridge, Colorado. Built by the North American Gold Dredging Company in 1898, it operated for one season and was a failure. Circa 1898-1899.

The Risdon No. 1 dredge under construction on the lower Swan River, north of Breckenridge, Colorado. Built by The North American Gold Dredging Company in early 1898, the dredge began operating by the middle of May that same year. It was dismantled in the autumn of 1899.

The Risdon No. 1 dredge working on the lower Swan River in the summer of 1898. Operated by the North American Gold Dredging Company, north of Breckenridge, Colorado.

Risdon No. 3 gold dredge on the lower Swan River near Breckenridge, Colorado, in July 1899, prior to construction of the housing. This was the third Risdon dredge built by the North American Gold Dredging Company. Operations began by August 19, 1899; it sank on July 27, 1900. Despite being raised, the dredge did not operate again.