It takes me about 3 hours to get to the South Platte river at the far end of Metberry. That's from my house in Centennial near Parker/Arapahoe. From HR, subtract 20 minutes.
This is a popular camping weekend, so expect to see others already there or on the trail.
Deckers Store is right in the tiny town of Deckers at the "T" where CO67 and Deckers Rd meet. There is the Flies and Lies fly shop in the same little building. No gas, the store will have basic provisions. This time of the year they have GREAT ice cream too. Any of you coming from Evergreen/Conifer/Foothills would take 285 to Pine Valley Rd/CO126 and come in that way. Southsiders would take 25 South to Happy Canyon Rd, 85 to 67. Deckers store is almost exactly 40 miles from Evergreen or Centennial.