Arturo, I appreciate your input. I've personally spent some time on Clark Dry Lake, and while the runways have never really been visible (it's a service road across the lake that's visible in 1994) I based the runway positions on an older USGS map and several stone markers I found on the lakebed that seemed to indicate the runway position. Mostly guesswork and I wouldn't call it accurate by any means, but there is a method to the madness!
FSX Scenery--California Forgotten and Abandoned Airfields
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