Not Elvington but Carnaby near Bridlington. Elvington was one of the selected SAC bases extended post war but I don't think the USAF ever moved in (like Bruntingthorpe).
The three emergency runways were 3,000 yards long and 150 yards wide giving 3 parallel landing strips on each one, the technique being to use one for landing, then if it got blocked by a crash, use the next one til that got blocked, then use the third, by which time the first should have been bulldozed clear - literally! There was no intention to recover crashed aircraft for possible re-building you see.