Water causes swelling of Mile Hill Drive

The in basket: I was alarmed Thursday night when I suddenly ran over something in westbound Mile Hill Drive right at the Long Lake Road traffic signal. 

Neither my wife nor I had seen anything in the road. The sudden bump didn’t seem severe enough to have been a person, or even an animal, though it was more than a speed hump would have caused. We didn’t see anything in the road when we came back the other way. 

By Friday morning daylight, though, a large swell in the pavement was visible. The county had posted one of those “Motorcycles Use Extreme Caution” signs, one of the rare times they seemed to be helpful. By the next day, the lump was barely noticeable. 

I’ve seen many slumps and even washouts after the kind of rain we had Thursday. But a swelling was new to me. I would think a rise like that supported only by water would have made the asphalt break up. I asked what was going on.

The out basket: Doug Bear of Kitsap County Public Works said it was, indeed, caused by water. 

“We have found that water is infiltrating under the roadway causing the portion you saw to raise up. We did some preliminary work to minimize the bump and plan additional work in the next week or two to determine what is happening. 

“We are going to use our video pipe inspection system to look at the drainage there to determine where the problem is. Once we identify that we will develop a permanent solution.”

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