UP stopped running into CdA in 2003. They left a 2-mile stub in place to Feeley Spur (where the UP branch crosses Prairie Aveneue); there's a propane supplier here which UP continues to switch.

UP also left the tail end of its branch in place between Gibbs and the DeArmond Mill near North Idaho College in CdA. BNSF and UP both switched loading docks at this mill; after UP left, BNSF began working the UP dock. Mostly boxcar shipments of 2x4 and 2x6 studs. BNSF local would pull into town on its own track, back through the wye to switch the BNSF dock, head west to Gibbs, pull through the old interchange connection, then back down to the UP dock. (Passing through the UP tunnel under BNSF directly beneath the U.S. 95 bridge.) All of this ended when Stimson closed the DeArmond mill in 2008.

You're right about the NP alignment in CdA being mostly gone, but there are slivers of it you can still see in the trees just west of Northwest Blvd, near the former site of Blackwell. Not much left to see of the street trackage BN still had to the east side of town to the Potlatch Rutledge mill, where the CdA Resort golf course now operates. There's still the top edge of a tunnel portal protruding above ground at the southeast corner of Government Way and Garden Avenue, where MILW had a tunnel passing under that intersection on its way down to the waterfront. Plenty of old signs of former GN and MILW rights of way west of CdA, and west of Post Falls you can bike on one of the ROWs and still see remnants of the other, clear to the state line where GN and MILW had bridges over the Spokane River. Very hard to find traces of the NP/MILW stub that crossed the river near Gibbs and served a mill out on Blackwell Island.

What's left of the BNSF branch today is ex-NP from the main line at Hauser Junction to Post Falls, then ex-GN from Post Falls east to almost Huetter. You can see the S-curve transition between GN and MILW just east of the North Cedar Street crossing on the far east side of Post Falls. Between Atlas and Gibbs, the BNSF branch switches back to ex-GN the rest of the way into CdA. Some of the former GN and MILW grades are built over in places and hard to trace because the two companies consolidated portions of their parallel branches in 1945.

GoogleEarth still shows the Stimson mill at Atlas, west of CdA along Seltice Way. This has long since been cleared off and it's now just dirt, waiting for somebody to build something there. The Riverstone cinema complex and adjacent hotels and office buildings at Gibbs were home to another large mill complex that died in 1990.

Go to msrmaps.com (formerly terraserver-usa.com) and zoom in until you're viewing CdA's 7.5-minute topo map. It gives a clear depiction of most of the trackage as it existed after the 1940s MILW/GN consolidation, but not all abandoned segments are shown.