No washouts expected here
I don’t know if the culvert shown in the photo is the world’s shortest, but it has to be a contender for the title. Roughly 14 inches in diameter and a bit over 3 feet in length, the corrugated metal pipe is only about 3 times as long as it is wide. The mini walkway the culvert supports provides a year-round dry crossing of the drainage ditch that lines Beck Road in Mason County near Belfair State Park. There’s a path through the greenbelt behind it to the property owner’s home.
I took the photo near the end of today’s bike ride after dodging rain showers all afternoon. If I had waited around, I might have seen the culvert in action as heavier rain moved in later and doused the area.
Mud Bay Blog 
It looks a lot shorter in the picture. I guess it was done by the property owner. I wish you had stayed around. Iw would have been interesting to see how it worked in the rain.