One of the many interesting things about this segment of US 34 is that it essentially follows the valley of the Colorado River between its headwaters in Rocky Mountain National Park and its confluence with the Fraser River in Granby. Consequently US 34 also provides access to all of the major water collection components of the Colorado-Big Thompson Project. Those include Grand Lake (Colorado's largest and deepest natural lake) and three artificial impoundments (Shadow Mountain Lake, Lake Granby, and Willow Creek Reservoir). Since there are many examples of highways which were originally built parallel to rivers, but which later had to be realigned because of water storage projects that were built in those valleys, I set out to explore whether US 34 had any historic alignments that existed prior to the reservoirs in the Middle Park area.
Shrine Pass was not considered to be a good candidate for development into a primary state highway, so US 6 traffic was directed further south from Copper Mountain, along today's SH 91. Drivers had to go over Fremont Pass and all the way down to Leadville. There, traffic was directed north (overlapped with westbound US 24) over Tennessee Pass and up to Minturn.
In 2001 construction began on Denver's "T-Rex" project (TRansportation EXpansion). This involved widening I-25 and adding light-rail service along the corridor through the south metro area. It was a great investment benefitting Denver commuters, but one unfortunate casualty was the old Colorado and Southern Railway bridge over I-25 (and unmarked US 87), just north of Evans Avenue. The rail line had not been used for years, but its bridge was a cool landmark that provided a little extra character in south Denver.