You didn't say if you have seen any sign other than the first wk. This late in the season is the best time to call in gobblers!
The hens may be less interested but the gobblers are still boys and will come in easer if you can find em. If the area is heavily pressured you may need to go deeper into the woods 1 mile or more as most hunters don't go that far. If the creek is stopping you from going that fare in you need either to find other access to the other side or find a new hunting area.
You need to find the roost, if your owl call is not working switch to a higher pitched call like a coyote.
If your in a hilly or mountainous area with gully's and ridges look for south and east facing sides with water not fare away. Get to a high point and locate the roost.
Calls that work for me are yelping and cutting and if they are hung up I move forward and call aggressively. Best times to hunt are early am and after 3pm at least for me, that is when they are closer to their roost. The gobblers I hunt return to the vicinity of the roost 150 yards or so and start gobbling looking for hens, they hear me and either right away or 30 min. come in.