Here (https://www.google.com/maps/d/edit?mid=1l6Ctzshh-ZpC2bhUOjP7XAoo1QTGw0pw&usp=sharing) is the map of the PP-OO in Utah, based on the route described in the "1919 Official Automobile Blue Book". The route is split into a Northern & a Southern route in the Eastern half of the state. The first few stretches between Rangely, CO & Vernal, UT & Cisco, UT to Green River, UT have been uploaded. I've noticed that the Northern routing of the PP-OO between Jennings, UT & Vernal, UT swings farther North than US 40 & bypasses Naples, UT.
I've found a old abandoned bridge along the Northern route of the PP-OO Southwest of Vernal, UT.
(https://drive.google.com/uc?export=download&id=1_24Y5ATipCQGnUZ7xMek3p4p9Nzk89Se)
I've also found where one old bridge & possibly another even older bridge once were on the Northern PP-OO alignment Southeast of Ft. Duchesne, UT.
(https://drive.google.com/uc?export=download&id=1X0TQOwnT-p5pfrjBsHZecQS4LwN6vcYI)
(https://drive.google.com/uc?export=download&id=1Xs7uPtXz5qMCwzsXp3PnZigiX56PaGxy)
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The old abandoned bridge that I found Southwest of Vernal, UT doesn't seem to have a listing on Bridgehunter.
Quote from: US 89 on March 07, 2021, 06:06:32 PM
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Sorry, I forgot to enable sharing on the map. The link is working now.
I've uploaded the section between Vernal, UT & Roosevelt, UT. I'm not sure if the routing is accurate as it seems to be a mile longer than it should be.
Another section from Roosevelt, UT to Duchesne, UT is now up.
I've revised a section in Roosevelt, UT & added a section between Roosevelt, UT & Heber City, UT. Parts of this routing have been obliterated by the Strawberry Resevoir. Also, from what I figured out, the village of Strawberry, UT used to be located along the Strawberry River, but was moved a few miles North onto higher ground to avoid flooding.
Another section between Heber City, UT & Salt Lake City, UT, is now up. Starting at Kimbal Junction, UT, the "PP-OO" follows the Lincoln Highway to San Francisco, CA. I think that this map section is 95% accurate.
I've modified part of the routing in Green River, UT & added another section between Green River, UT & Price, UT.
I found a couple more bridge abutments, along the "PP-OO", between Woodside, UT & Price, UT
(https://drive.google.com/uc?export=download&id=1Y-64OWIXJvUGY6IvpLWsOaTCAQCI8WZF)
(https://drive.google.com/uc?export=download&id=1Xe8YK3HQgQmOQaHec81nLlQjfXU4iMuS)
(https://drive.google.com/uc?export=download&id=1PjlexeAATNf2s3ko1rAgKK8NMiUQMVoB)
In mapping out the section of the "PP-OO" between Price, UT, to Salt Lake City, UT, I think that I found one old bridge & some more old bridge abutments that were on different alignments of the "PP-OO", either pre, or post 1919, near Castle Gate, UT.
(https://drive.google.com/uc?export=download&id=1v24-JtO6YF2lCiEwqsN4N025433VCvrR)
I've found what could be an even older alignment of the "PP-OO", North of Royal, UT.
(https://drive.google.com/uc?export=download&id=1jyE84z8lB_eoLsGpFH21G8zUAVq3BUkO)
Is there any specific reason you have it on that western alignment near the top of the Jordanelle Reservoir? I've always had the understanding that that was a newer alignment, and that the original route followed the eastern road (Google labels it "Perspective Dr" and "Longview Dr" ) and went through that wye where the Ross Creek trailhead is now. This would also make sense because the original, pre-1917 route from Salt Lake to Wyoming actually went through Kamas, since the modern road through Silver Creek Canyon hadn't been built yet.
I'm also pretty sure a good bit of what you've identified in Parleys Canyon between Lambs Canyon and Parleys Summit (exit 137 to 140) is in fact a railroad grade that was in service until the 1940s.