Bridge: (Satellite)
Aux Spillway: (Satellite)
Main Spillway: (Satellite)
Inlet Control Works: (Satellite)
Outlet Works: (Satellite)
Powerhouse: (Satellite)
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| TownOfGore |
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| USACE_lake |
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| WildlifeDepartment "Impounded in 1952, Tenkiller is the only controlled impoundment on the Illinois River and can experience prolonged drastic lake level fluctuations....Due to its depth, the lake provides cool water for the popular year-round trout fishery in the tailwaters." [I did see a lot of photos of people fishing downstream. And there must be bass in the lake. (I didn't watch it.)] |
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| dvidshub "Photo By Brannen Parrish [USACE provided] | The State Highway 100 Bridge over Tenkiller Dam's main spillway, near Gore, Okla., awaits motorists in the late afternoon sun, Sept. 9, 2025. The U.S. Army Corps of Engineers, Tulsa District will close the bridge for demolition and replacement starting Oct. 6, 2025. The bridge has served motorists enabling passage over the spillway for more than seven decades." Demolition and construction is expected to take 2.5 years and cost $28.7m. |
The old bridge was a steel girder bridge. I don't know if the new one will be steel or concrete.
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| USACE_project |
I was not able to find an overview photo on any of the USACE web pages, but I did find this drone video. The main spillway is in the center and the aux spillway is on the right. The earth dam is to the left of the aux spillway in the background because the road does a 90-degree bend after the aux spillway.
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| 2:32 video @ 0:08 |
It looks like the spillway flow is carving off huge blocks of rock. I wonder what type of rock it is.
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| @ 1:25 |
But I still don't have an overview of the earth dam, so I'll go with a satellite image. From left to right: powerhouse, outlet works, inlet works, main spillway, aux spillway and earth dam.
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| Satellite |
I had to dig deep, but I finally found that the powerhouse has 2 units for a combined capacity of 39mw. I still don't know the flow rate when the generators are operating. [HydroReform]
Why won't USACE include these numbers on their webpages?
I wish all USACE websites had a graphic like this.
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| USACE_tenk |
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| GreatFallsTribune [They have not updated this data to include the aux spillway.] |
Spillway and Outlet Works: The main spillway capacity is 290,400 cubic feet per second (cfs) at maximum pool (elevation 672.2) with flow controlled by ten 50- by 25-foot tainter gates. The auxiliary spillway capacity is 229,340 cfs at maximum pool with flow controlled by five 50- by 35-foot tainter gates. The crest of the main spillway is at elev. 642 and the auxiliary crest is located at elev. 632. A flood control outlet extending through the narrow ridge comprising the right abutment consists of a 19-foot conduit. Capacity of the conduit is 23,300 cfs at the top of the flood control pool. Flow through the conduit is controlled by two 9- by 19-foot tractor-type service gates installed at the upstream end of the conduit and operated by individual electric hoists located on the operating floor of the gate tower structure.Hydrologic Data: Estimated peak discharge and volume of the December 2015 flood were 149,200 cfs and 900,763 acre-feet, respectively. The record peak release was for this flood at 35,000 cfs. Total runoff from the drainage area above the site was 10.48 inches for the entire period. The March and April 1945 flood had more total runoff with lower peak flows at 1,184,000 acre-feet and 118,000 cfs, respectively. Total runoff from the drainage area above the site was 13.79 inches for the entire period. The May 1950 flood had a peak discharge of 180,000 cfs with a volume of 720,000 acre-feet, which is equal to 8.39 inches of runoff.
Just 35kcfs makes a big splash.
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| USACE, Tulsa District posted "Here's a look above and below Tenkiller Dam at about 3:00 p.m. today [Dec 29, 2015] as they were releasing just under 35,000 cfs after receiving several days of heavy rain throughout the region." |
All of the photos I found were of the bridge over the main spillway. Here is a view of the bridge over the aux spillway. No one talks about replacing this bridge. When was the aux spillway built?
Found the construction date: "Construction of the auxiliary spillway was completed in January 2009." [USACE_data]
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| Street View, Apr 2025 |
Jan 2026:
David Holeman posted four photos with the comment: "Went by tenkiller dam and took a few more pictures of progress. They got the bridge deck off of it."
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