The EIA has released its Petroleum Supply Monthly with C+C production numbers through May 2014. Of all the EIA data releases this seems to be the most accurate. However in some cases it is only as good as a few EIA employees guesses. And the more state data they have to work with, the better their guess.
The data in this report goes back to 1920 for total US production and to 1981 for individual states and offshore production. However I have chosen to shorten the time frame for my charts in order to better show what has happened recently.
US production was down 36,000 bp/d in May to 8,357,000 barrels per day. US production took off in mid 2011 when Shale production took off and has risen some 3,300,000 since. Of course there was shale production prior to this but it was only keeping US production on a relatively flat plateau.
Everyone is interested in the Bakken so I have combined the two Bakken states. Of course there is production in these two states outside the Bakken but this is the best I could do. Note that when the Bakken has one bad month as they had in December, it takes several months to get back to their prior production level.
