The Municipality of Clarington was created in 1974 following the approval of the Regional Municipality of Durham Act. The act brought together 21 municipalities, creating a two-tier government structure with a regional government and eight individual Municipalities. Clarington was formed by the amalgamation of the former Town of Bowmanville, the Village of Newcastle and the Townships of Clarke and Darlington. In 1993, the Municipality was renamed to Clarington: a blend of the names of the original Townships of Clarke and Darlington. Today, Clarington is comprised of four urban centres: Courtice, Bowmanville, Village of Newcastle and Orono. The Municipality is also home to 13 hamlets. Bowmanville is the largest community in Clarington. It is also the home of the Municipal Administrative Centre.
Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 inch baking dish. In a large bowl, stir together 1 1/4 cups sugar, baking soda, salt and 2 cups flour. Stir in the eggs and sour cream until smooth, then fold in the rhubarb. Pour into the prepared dish and spread evenly. In a smaller bowl, stir together the remaining 1 cup sugar and butter until smooth. Stir in 1/4 cup flour until the mixture is crumbly. Sprinkle the mixture on top of the cake then dust lightly with cinnamon. Bake in the preheated oven until a toothpick inserted in the center comes out clean, about 45 minutes.