Another way of stating this: expected export tonnage of general cargo through the Port of Chicago in 1960 will increase 399% over the tonnage reported moving through the Port of Chicago in 1956, and 512% in 1965 over the same 1956 base. Of the total of 489,374 tons of general cargo estimated to be shipped through Chicago in 1960, 34.8% will be shipped by firms not using the Seaway in 1956, but who contemplate shipments by that route in 1960. This is equivalent to a total of 170,220 tons of general cargo. In order to obtain a more precise picture of past and future export movement through the Port of Chicago, a breakdown by commodity groups will reveal the nature of the movements contemplated. Sub-Areas Where 1956 Export Shipments Originated within Chicago's Tributary Area Chicago's Tributary Area was divided into nine sub-areas in order to define points of origin of 1956 export shipments. The sub-areas are as follows: (1) Chicago Metropolitan Area (6 county area) (2) Downstate Illinois, outside Chicago Metropolitan Area (3) Indiana and southwestern Michigan (4) Western Kentucky and western Tennessee (5) Missouri and northern Arkansas (6) Kansas and eastern Colorado (7) Nebraska, southeastern Wyoming and southern South Dakota (8) Iowa and southern Minnesota (9) Southern Wisconsin As may be seen in Table IV, 41.0% of the total general cargo tonnage originated in the Chicago Metropolitan Area, 20.2% originated in downstate Illinois, 18.9% of the total tonnage originated in Iowa and southern Minnesota, and 9.9% originated in Indiana and southwestern Michigan. These four sub-areas accounted for 90.0% of the total general cargo shipments from the Tributary Area in 1956. An additional 3.4% of the general cargo in export trade originated in southern Wisconsin, 2.8% originated in Missouri and northern Arkansas, and the balance of 3.8% was originated in the balance of the Tributary Area. Taken by commodity groups, of the 1.1 million tons of general cargo in foods and animal products, nearly 68.1% originated in Illinois, Indiana and southwestern Michigan, of which 24.8% originated within the Chicago Metropolitan Area, 25.1% originated in Indiana and southwestern Michigan, and 18.2% in downstate Illinois. 27.4% originated in Iowa and southern Minnesota. Only 3% originated in southern Wisconsin, and 1.3% in Kentucky and Tennessee, and less than 1% in the other 3 areas. In commodity Group 2, composed of textiles, paper, apparel, printing and leather, 46.1% originated in the Chicago Metropolitan Area, 28.5% originated in Indiana and southwestern Michigan, 15.7% originated in southern Wisconsin, and 9.5% in Missouri and Arkansas. The other areas had little or no tonnage of export general cargo of Group 2 commodities originated in 1956. Group 3 composed of chemicals, coal products, petroleum, rubber and plastics, was most highly concentrated in the Chicago Metropolitan Area, with 83.9% of the tonnage originating here, 6.5% of these products originated in Missouri and Arkansas, and an additional 6.0% in Indiana and southwestern Michigan. The balance of 3.6% originated elsewhere in the Tributary Area. Group 4, primary and fabricated metal products, was again highly concentrated in the Chicago Metropolitan Area. The products in this group originated 70.8% of the tonnage within the Chicago Metropolitan Area and 25.3% originated in downstate Illinois. A total of less than 5% of the tonnage originated elsewhere in the Tributary Area. The Chicago Metropolitan Area is the largest in the country in the production of machinery and machine parts, and 33% of the total export tons of Group 5 commodities, which includes both electrical and non-electrical machinery, transportation equipment and instruments, originated here. An additional 30.9% of general cargo exports of these commodities originated in downstate Illinois. Iowa and Minnesota originated 24.3% of the total export traffic in Group 5, and southern Wisconsin shipped 6.7% of the total. Of the total furniture, wood, stone, clay and glass products and miscellaneous manufactures included in Group 6, 31.7% originated in the Chicago Metropolitan Area, 38.8% in Missouri and Arkansas, 15.8% in Indiana and southwestern Michigan, and 6.5% in Wisconsin. How 1956 Export Tonnage Moved to Ocean Ports The movement of waterborne export tonnage of general cargo originating in the Tributary Area to ocean ports, as shown in Table V, was primarily made via railroads. 1,773,000 tons, or 70.5% of the tonnage, moved by rail. Motor ca_riers handled 423,000, or 16.8%, and barge lines moved 6.7% of the total. 5% of the total tonnage moved by rail-barge, or other combination of types of carriers. Motor carriers exceeded rail carriers only in the commodities of Group 3, which are chemicals, coal, petroleum, and rubber products. Trucks handled 49.1% of Group 3 commodities, and only 46% moved by rail. In Group 4, which includes primary and fabricated metals, the largest proportion moved by barge, with 43.0% of the tonnage moving to ocean ports by barge lines. 33.9% of Group 4 commodities moved by rail, 18% moved by a |