Great Northern Railway Historical Society Blueprint Collection JSBP1206, Des Lacs, North Dakota, 1939. Great Northern Blueprint Number 141-1161-46, Bridge 132.1 Cofferdam. Over Reservoir, Earth Filled Cofferdam. Authorization for Expenditure 56830. Interstate Commerce Commission Account Number 6, Bridges, Trestles, and Culverts. Other ICC account descriptions: ICC Account Number 6, Bridges and Trestles.