In June of 1938, flood waters broke through the dykes. 14,5000 acres of reclaimed grain land were flooded. The cost of rebuilding the dykes was estimated at $150,000, but the dykes were considered so essential that the work was started as soon as conditions permitted.
Agriculture in the Creston Valley expanded rapidly into the mid-1940's. Construction of a creamery began in 1940, and agricultural labour shortages occurred when a pea plant was opened in 1941. The Future Farmers of Canada was organised in Creston in 1944.
When World War II broke out, residents of Creston once again rallied behind the war effort. Men and women went overseas. The local government applied rationing to coffee, tea, and sugar. The IODE began knitting woollen items, and the Red Cross organised packages to be sent to the men overseas. Local residents consistently surpassed fund-raising goals and quotas for government-issued Victory Bonds.
The announcement of the war's end on May 7, 1945 brought on a spontaneous celebration. Stores were closed, the streets were decorated with flags and bunting, and a day of prayer was declared. A victory dance was held when the war in the Pacific was over.
The war years were not, however, entirely dedicated to rationing and fund raising. The Lions Club organised the first Blossom Fest in 1942, and its success encouraged the club to repeat the project in 1943 - and every year since, with a Blossom Fest Queen contest added in 1945.