Columbine Pass is a high mountain pass at an elevation of 2.790m (9,154ft) above the sea level located in Montrose County, in Colorado, USA.
The road to the summit, located within the Dominguez-Escalante National Conservation Area, is totally unpaved. It’s called Nucla-Delta Road. Once it reaches the Uncompahgre National Forest it is also known as FSR 503. It’s a dirt, wide, smooth well graded road running all the way across Umcompahgre Plateau. It’s a fairly easy road although there are long stretches with drop offs on one side.
The road is usually impassable from October to June (weather permitting). It’s 81.43km (50.6 miles) long, running west-east from Nucla (in Montrose County) to Delta (the county seat of Delta County).
Pic&more info: https://activerain.com/blogsview/4694160/the-delta-to-nucla-road-over-the--uncompahgre-plateau