For anyone visiting the park in the next 3+ months, beware road construction!
The northern access road (Persimmon Gap, south of Marathon) is one lane for a few miles between the Persimmon Gap visitor's center and Panther Junction. The expected wait time at that spot is 20 minutes.
Just outside of Rio Grande Village, on the east side of the park, there is more construction - again, one lane is closed and the delay can be up to 20 minutes. BEWARE LOOSE GRAVEL. Construction speed limit on that stretch is 25 mph and the road is being resurfaced (with gravel), so be sure to keep a good following distance - your windshield will thank you.
Rumor has it that the western entrance also has some construction, so it may be in the same condition as the previously mentioned spots.
The campground up in the basin is closed for construction as well.
Call BBNP for construction updates and information on delays.