Don thought I should add this bit of info: As you are driving north from Durango on Hwy 550 to the United Campground entrance: the right hand turn onto CR 203 for United Campground is a
"hairpin turn".
Additional info: before you get to the turn-off of CR 203, Hwy 550 takes a slight turn to the right...just enough so the entrance to CR 203 can surprise you. As you are driving along Hwy 550 you will see the United Campground sign as well as the campground itself (Hwy 550 is above the campground, Animas River and the train tracks). There is a mile marker before you have to turn off of Hwy 550, MM25 (right side, little green sign); also, @ the CR 203 turn-off is the entrance to the "Iron Horse Inn" (huge sign).
Hope this helps...drive safe, see you soon.
PS
temp @ park last night about midnight was 55; this morning @ 6:30 it was 44. It's 11 am right now and it's 72
. Weather Channel phone app says nice weather through Saturday with day time highs in the mid 60's-low 70's & night time lows in high 30's-low 40's. Possible rain on Sunday...think western slope/dry as a cracker!