A GOP source sends along this information about three key counties in Colorado:

Adams County (lean D county) — strong Republican turnout based on morning data — on track to win since first time in 1984.
AB/EV margins will be hard for them to overcome today. Right now — it’s a virtual tie. E-day is 3696 D, 3549 R
Arapahoe (Swing County) — 4,860 Democrat & 5,271 Republican — Election Day so far.
Over 83% of the vote was AB/EV — 75,653 Democrat & 75,812 Republican.
Jefferson County (Swing) — 78,738 Democrat & 85,378 Republican for AB/EV.
Waiting on Election Day.