Catherine Jamison (born March 26, 1950) also known by her married name Jamison-Imwalle is an American former competition swimmer who swam for Portland's Multinomah Athletic Club and participated in the 1968 Mexico City Olympics for the United States, finishing 5th in the 200-meter breaststroke.

As a six-year old, Jamison had her first swim lesson at the outdoor pool at Portland's Jewish Community Center, but was not pleased with the experience.

Achieving local recognition at an early age, while still at Hayhurst Elementary she was part of the girls' swimming team that won Portland's city championship in four successive years from 1959-1962.

She was a 1967 graduate of Portland's Wilson High School where she was on the year book staff, played violin and viola, was a member of Quill and Scroll, maintained an "A" average, and was in the Mathematics honorary.

[3][6][5] During her High School years, she was an Oregon state champion four times in the 100-yard breaststroke from 1963-1966, and held titles in the 200 freestyle and 200 medley relay.

[8] While swimming for the Multinomah Athletic Club at age 14, Jamison competed in the 1964 Olympic trials, but did not make the U.S.

[10][2] On August 20, 1967, she secured a spot in the FINA games with a 4th place finish in the 200-meter breastroke (2:50.4) in the National AAU Swimming Championships in Philadelphia.

Paul, also a student at Santa Clara, had graduated in June, and had plans to begin studies towards a Masters degree in Marketing in Fall, 1971.

[13][14] The couple left California's Bay Area in the early 1970's and moved to Bend, Oregon about 150 miles Southeast of Jamison's native Portland.