John Nolte has a source here on the Front Range who has some solid numbers:
Adams County (Lean D County) – Strong Republican turnout based on morning data – on track to win since first time in 1984. Absentee/Early Vote margins will be hard for Democrats to overcome today. Right now it’s a virtual tie. Election Day thus far is 3696 D, 3549 R
Arapahoe (Swing County) – Election Day turnout this morning: 4,860 Democrat & 5,271 Republican. Over 83% of the vote was Absentee/Early Vote: 75,653 Democrat & 75,812 Republican.
Jefferson County (Swing County) – Absentee/Early Vote: 78,738 Democrat & 85,378 Republican. No election day numbers.
Rich Lowry has much more from other battlegrounds.