These files accompany the manuscript “An Experimental Assessment of Analytical Blockage Corrections for Turbines”. The files include turbine performance data collected in the Alice C. Tyler recirculating water flume at the University of Washington and the Jere A. Chase Ocean Engineering Laboratory tow tank at the University of New Hampshire. The data contain cycle-average turbine power coefficients, thrust coefficients, and tip-speed ratios used to compare performance at different blockage ratios. The processing code used to produce the results in the manuscript is included as well. The data format is described in detail in the README file.