Luke/Mike,
This bridge is indeed a Thacher truss; it is the old Yellow Church Campground bridge, which was located in Lac-Qui-Parle county and was relocated to Dakota County.
The configuration appears to be a Thatcher truss to me, but I will let the old truss experts make the final call.
Yeah, its a Thacher the same gig as the Ellsworth Ranch Bridge in Iowa.