24 Mar 2017: In April 2015, U.S. crude oil production reached 9.627 million barrels per day (mb/d). This was the highest production level since the early 1970s, when U.S. crude oil output briefly exceeded 10 mb/d. One of the biggest differences between the production in the 1970s and now is the source of the crude oil. Substantially all of the U.S. production 45 years ago came from regular onshore fields in the Lower 48 States. Large scale Alaskan production did not come online until 1977 and Gulf of Mexico offshore production only started in the 1980s. Please fill out the form to read the full article.