It seems this bridge is doomed.
From an article in the Iola Register (behind a paywall) Jan 31, 2013:
"The fate of the Hegwald Bridge, or county bridge 2.8-P.6, in Humboldt has been decided. It will be demolished and replaced.
The bridge, which crosses Owl Creek west of Chanute, is eligible for Kansas Department of Transportation funding. The county will pay 20 percent of the total cost of the construction, and KDOT will pay the remaining 80 percent. According to KDOT, any bridge that receives a sufficiency rating of 50 or lower on the 100-point scale is eligible for funding ó the Hegwald bridge rated at 17.9."
And from August 28, 2013:
"See it before itís gone: Allen County crews are removing the 'Hegwald Bridge' west of Humboldt. The $694,933.50 project to replace the bridge will most likely take place at the end of 2013 or the beginning of 2014, said Bill King, director of public works."
As of November 27, 2013, the bridge is still in place, with no signs of impending demolition.