Processed heat flow data acquired using the thermal blanket device deployed by ROV Jason II during the 2013 Atlantis expedition AT26-04 at the Cascadia Subduction Zone. The data file is in ASCII format and was generated as a part of the projects called 'Thermal Structure of the Cascadia Subduction Zone on the Washington Margin' and 'Thermal Structure of the Cascadia Subduction Zone, Grays Canyon Discovery Corridor, Washington'. Funding was provided by NSF grants OCE11-44164 and OCE12-49552 (Investigators: H. Paul Johnson, Evan Solomon, Robert Harris). Data was cited by Johnson et al., 2013 and Johnson et al., 2014.