Today’s postcard from a 1940 Oklahoma souvenir pack is of a horseshoe curve just 1,500 feet from Turner Falls, where Highway 77 swoops its way through the old roots of the Arbuckle Mountains.

The 6-mile stretch of road was constructed by convicts back in 1925 and 1926. They lived in a tent camp near the falls. Notice how in the first of four construction slides below, from the 1920s, that back then there were no cedar trees inside the horseshoe curve.
It took two years and the blasting of four million cubic yards of rock to shoot Interstate 35 through that stretch of the Arbuckle Mountains. Its opening in August 1970 eliminated the bottleneck of the horseshoe curves on the two-lane US 77 linking the Oklahoma City and Dallas metropolitan areas.

Since the postcard was made, another access road to the falls area was built down its ravine. Here a flipped view of the area, looking south.

US 77 runs north-south across central Oklahoma from Kansas to Texas. It was the first highway in Oklahoma to be paved entirely from border to border. If you are ever on I-35 between OKC and DFW, take the opportunity to turn off onto US 77 at Turner Falls, and while you’re there, stop in at Arbuckle Mountain Fried Pies and enjoy some of the creations the Pletchers have been serving up for decades.
To me, US 77 south of OKC is full of memories. I earned my bachelor’s degree in Norman, often turning off I-35 onto 77 to enter town on Flood Avenue. My holy roller grandmother lived in tiny Paoli on down the old highway. When I stayed with her as a child, we went shopping in Purcell and Pauls Valley — the Toy & Action Figure Museum is now a great stop at the latter. A flabbergasting childhood moment was when Big Mama, who was actually a tiny woman, took me to Wacker’s Variety Store and bought me a Space:1999 laser pistol, at a time when she wouldn’t even allow a television in her home.

Big Mama’s house was only 150 feet from the centerline of old Highway 77, and before I-35 opened I remember how her house would shake as truck after truck rumbled by. The traffic on US 77 was so heavy you didn’t dare try to cross it on foot, and we had to walk three blocks north to Main Street, where there was a pedestrian underpass, to cross over to the east side of town. All that changed once I-35 opened in 1970, the stretch through Garvin County being one of its final remaining gaps in the state.

My mother was born farther south in tiny Hennepin, on a farm with no electricity or running water, and after over a dozen moves with her family across multiple states, she wound up back near where she started, graduating from Wynnewood High School. Two of my spinster aunts lived in OKC but subscribed to the Davis newspaper and bought Arbuckle Mountain Fried Pies at its OKC location. Finally, my parents often took me trailer camping at Sulphur’s Platt National Park, which became the Chickasaw National Recreation Area.
The Arbuckles are southwest of Sulphur, and they were named after General Mathew Arbuckle, an early commander at Fort Gibson, which was featured on a previous postcard. Those mountains are some of the oldest in the United States, with a core of Precambrian granite and gneiss that is 1.3 billion years old, overlain with Cambrian rhyolite that is 525 million years old. From 515 to 290 million years ago, seas periodically inundated the area, depositing limestone, dolomite, sandstone, and shale.
While taking a geology class at OU, we did a field trip that included a stop at the Arbuckles to observe the tombstone topography of its Ordovician limestone and dolomite layers. There are 15,000 feet of complexly folded and faulted sedimentary rocks, including these differentially weathered and eroded layers which were steeply dipped by mountain-building processes.
A Bartlesville Parallel
US 77 runs through Ponca City, just beyond the western border of the Osage Nation. Ponca City was the home of Marland Oil, which controlled about 1/10 of the world’s oil reserves before being merged into Conoco in 1929.
US 75 runs through Bartlesville, just beyond the eastern border of the Osage Nation. Bartlesville was the home of Phillips Petroleum, which controlled about 1/500 of the world’s oil reserves in 2002 before it merged with Conoco, which by then controlled maybe 1/300 of the reserves.
Our next postcard will take us just a few miles eastward to some much smaller waterfalls at the former national park.





















































