In 1985, the Soo Line purchased the Milwaukee Road, so it ended up owning both rail lines through Gordon. The older Soo mainline was abandoned, and the newer Milwaukee Road line was upgraded. While I have not been able to document when the Soo Line mainline was abandoned, I suspect it was 1986 or 1987. The Soo Line was owned by the Canadian Pacific Railroad, but the CPR sold off former Wisconsin Central rail lines to the Canadian National Railroad in 2001. As a result, the CN now operates trains on the upstream bridge.
Ownership of the former Soo Line right-of-way, including this bridge, was purchased by the Wisconsin Department of Natural Resources. The DNR established a mixed-use ATV, hiking, and snowmobile trail called the Wild Rivers State Trail, also known as trail Corridor #35. The trail eventually spanned 96 miles from Rice Lake, through Spooner, Trego, Wascott, Gordon, Solon Springs, and into the south side of Superior. Once the DNR gained control of the rail line, the bridges were redecked with wood and guardrails were added.
Beyond that, I have not been able to find documentation on any of the bridge dimensions, and aerial photos at Google Earth are too foggy in that area to make accurate estimates.
The photo above is a profile view of the Wild River Trail Bridge as seen from the nearby Gate Road Bridge, located just downstream of the Soo Line Railroad right-of-way. The photo below is the west face of the bridge as seen from the southwest corner of the structure.