The famed and fabled ride up to Hurricane Ridge used to have wheel-eating curtain drains at the three tunnels in the middle of the ride. You had to cross them at an angle if you were traveling at speed, which you would be, if you were having any fun at all on the way back down.
They've since been replaced (last year) with more bike-friendly ones, thank goodness.
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●