I dont know where you live but we tend to do pretty good along the platte,there are plenty of SWA from Greeley to Julesburg that hold doves.There is also walk-in properties all over eastern colorado that we've had some succesfull hunts on.
Or if your on the south end of colorado the lamar area i heard is pretty good and theres both Swa & Walk-in all around that south eastern portion of Colorado also. I havent seen this years walk-in maps but they are usually about the same as last years.Check division of wildlife website they will have a pdf of last years you can look at.Good Luck.