Source: U.S. Bureau of Transportation Statistics  

Release: Transportation Services Index and Seasonally-Adjusted Transportation Data  

Units:  Thousands of Barrels, Not Seasonally Adjusted

Frequency:  Monthly

Pipeline movement is the sum of all crude oil and petroleum products moved between Petroleum Administration for Defense Districts (PADDs): PADD 1 to 2, PADD 1 to 3, PADD 2 to 1, PADD 2 to 3, PADD 2 to 4; PADD 3 to 1, PADD 3 to 2, PADD 3 to 4, PADD 3 to 5, PADD 4 to 2, PADD 4 to 3, PADD 4 to 5, PADD 5 to 3, and PADD 5 to 4 (from EIA Petroleum Supply Monthly, table 58) and crude oil production in Alaska (from EIA Crude Oil Production available here.

This data is collected by the U.S. Energy Information Administration (EIA) available here for Table 58 and available here for Alaska.