You have come up with a beauty CS ! I was sure that it used to be published in AIP/Jepp info but can't find it anywhere.
If you are lucky enough to work with a company that supplies you with a RTOW book, it is in the port information. Well it is in ours anyway.
As suggested earlier looks like a call to the Aerodrome Manager. What a pain in the arse.
Would be so easy to have the info on the 10-9 page.
I imagine that it is recognised, it is 60 Mtrs for instrument runways and UP TO 90M for non instrument runways.
When in doubt in the Boonies get some one to run down the strip in the car and measure it :-)
Plan "B" stay in bed until the weather gets better