In September 1924, the first convict labor road camps were organized in Carter and Murray Counties to construct US-77 through the Arbuckle Mountains.
In September, 1936, ten automatic electric traffic recorders were installed on the state highway system to record traffic volumes.
On September 1, 1916, the first state map showing all state roads designated as highways was published for use by the Department of Highways and counties governments.
On September 1, 1936, the first inventory of all roads in Harper, Jefferson and Pontotoc Counties was completed and preparation began on the first county transportation maps.
September 1, 1976 Richard D. Ward, the present State Highway Director became the first State Transportation Director according to House Bill 1791, Oklahoma Session Law 1976, page 338.
On September 2, 1931, Charles L. Wilson became the thirteenth Chief Engineer of the Highway Department.
On September 2, 1936, the first inventory of all roads in Murray County was completed and preparation began on the first Murray County General Highway and Transportation Map
On September 2, 1975 the Transportation Commission approved the designation of SH-30 Business from I-40 northwest of Erick to I-40 east of Erick in Beckham County.
On September 3, 1964, the project to construct I-35 from 12 miles north of the Red River to SH-32 was completed in Love County
On September 3, 1974, the Transportation Commission approved the removal of the Ozark Frontier Trail route markings in the state. Oklahoma, Arkansas, Missouri and Kansas agreed to remove the signs because there was little tourist interest.
On September 4, 1947, the Highway Commission approved the relocation of the Waynoka Maintenance Headquarters to Alva in Woods County.
On September 5, 1944, the Highway Commission approved the designation of SH-82A from SH-82 & Cherokee Ave. in Langley northeast to SH-28 at the Grand River Dam.
On September 5, 1972, the Transportation Commission approved the designation of SH-60 Truck Route from Pine St. to Cherokee Ave. in Nowata.
On September 5, 2000 the Transportation Commission approved the designation of SH-51 spur from SH-51 to SH-82 in Tahlequah.
September 6, 1926, was the first day of a seven day traffic study to determine the average traffic count on the State Highway System. This was the first official statewide traffic count study in Oklahoma.
On September 6, 1936, the first inventory of all road in Delaware County was completed and work began to prepare the first Delaware County Highway and Transportation Map
On September 6, 2007, the project to construct seven bridges and three miles of SH-11 through the Great Salt Plains in Alfalfa County was completed.
On September 7, 1974, the Department of Highways staff began moving into the new Department of Highways building south west of the Capitol in Oklahoma City.
On September 8, 1936 , the first inventory of all roads in Caddo County was completed and preparations began on the first Caddo County Transportation Map.
On September 8, 1953, the Highway Commission approved the designation of SH-29A from SH-29 to Foster in Garvin County.
On September 8, 1953, the Highway Commission gave approval for Mr. Terbush, the Shop Foreman at the Dept. of Highways Buffalo field office to construct a roughometer machine to gather data on new pavement surfaces.
On September 8, 1958, the Highway Commission authorized the Department to participate in a study by the Highway Research Board to compile highway laws of all States.
On September 8, 1964, the Highway Commission authorized the Director to oversee bridge projects for the new waterway navigation system on the Arkansas and Verdigris Rivers between Catoosa and Fort Smith, Arkansas.
On September 9, 1971, the I-244 construction project between Rockford Ave. and Delaware Ave. in Tulsa was completed.
On September 9, 1974, the Department of Highways celebrate its first official work day in the new Department of Highways building at 200 N.E. 21st St. in OKC.
On September 10, 1938, a plan to build a half-mile long bridge across Grand Lake on US-59 was announced. This bridge was later known as the Sailboat Bridge. It was rebuilt in 2001.
On September 11, 1950, the Highway Commission approved the designation of SH-95 from US-64 to Texhoma in Texas County.
On September 12, 1949, the Highway Commission approved the presentation of a 25 Year Award of Merit lapel pin and certificate for any Highway Department employee with 25 years of service.
On September 13, 1932, four projects were awarded to construct segments of the proposed Northwest Highway in Ellis and Harper Counties.
On September 14, 1958, construction began the I-40 Twin Bridges over the Canadian River west of El Reno in Canadian County. Each bridge is 2,530 feet long.
On September 14, 1970, the project to construct 4 miles of US-62 in Kiowa County beginning at the Comanche County Line and extending west was awarded.
On September 15, 1929, A. R. Losh became the twelfth Chief Engineer at the Oklahoma Highway Department.
On September 15, 1936, the first inventory of all roads in Comanche and Roger Mills Counties was completed and work began to prepare the first county transportation maps.
On September 16, 1958, a ground breaking ceremony was held for the I-40 Tinker Diagonal construction project in Midwest City.
On September 16, 1976, Gov. David Boren was on hand to dedicate the Oklahoma Department of Highways Division III Headquarters in Ada.
On September 17, 1936, the first inventory of all roads in Alfalfa County was completed and work began on the first Alfalfa County Highway and Transportation Map.
On September 18, 1936, the first inventory of all roads in Choctaw and Dewey Counties was completed. Work then began on the first county transportation maps.
On September 19, 1926, the second day of a seven day traffic count study was held to determine the average daily traffic on the State Highway System.
On September 19, 1940, the Highway Commission approved the designation of SH-82 from Spavinaw north to Langley in Mayes County.
On September 19, 1944, the Highway Commission approved the designation of SH-61A from SH 99, south of Fittstown, to Harden City in Pontotoc County.
On September 20, 1971, the project to pave a new section of I-40 east of US-69 in McIntosh County was award.
On September 21, 1964, the construction of the I-44 at US-169 interchange in Tulsa was completed.
On September 22, 2005, U.S. Transportation Secretary Norman Mineta designated SH-1/Talimena Drive in southeastern Oklahoma as a National Scenic Byway.
On September 23, 1935, the first Federal WPA Highway Project in the state was awarded for the construction of US-66 (now US-69) in Ottawa County.
On September 23, 1936, the Highway Commission approved the designation of SH-74A from SH-9 to Jenkins Ave. in Norman.
On September 23, 1941, the North Canadian River flooded the city of Guymon in Texas County, sweeping away the US-64 bridge.
On September 24, 1934, the project to construct three bridges on SH-56 in Seminole County was completed. The entire project cost $40,874.46.
On September 25, 1923, the U.S. Secretary of Agriculture approved federal aid funding to pave highways connecting county seats to major highways.
On September 25, 1936, the first inventory of all roads in Marshall County was completed and preparation began on the first Marshall County highway and transportation map.
On September 26, 1979, the Interstate Commerce Commission (ICC) declared the Rock Island Railroad Company cashless and unable to providing rail service. In a single day, one-fifth of the State’s rail system became inoperative.
On September 27, 1938, the Highway Commission approved the designation of SH-79 from US-70 to the Red River in Bryan County.
On September 27, 1974, a special meeting of the State Highway Commission was held. The first meeting held in the Commission Room in the new Department of Highways building.
On September 28, 1935, the project to pave US-62 in Anadarko was completed in Caddo County.
On September 29, 1936, the first inventory of all roads in Ellis County was completed and work began on preparation of the first Ellis County highway and transportation map.
On September 29, 1986, flooding washed out US-81 between Kingfisher and Dover and damaged the I-35 bridge over the Cimarron River in Logan County, causing I-35 to be closed.
On September 30, 1921, a Federal Aid project to construct a 57 mile section of highway across Choctaw County, through Hugo and over the Red River into Texas was awarded.
