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 Transportation Today
 

More to mowing than meets the eye

Most people look at the shoulder of a road in unincorporated King County and see a green assortment of grasses, weeds and blackberries. But staff with the maintenance section of the King County Road Services Division see work – a lot of work.


Maintenance crews rarely have a flat, level surface to mow when they are clearing the vegetation along county roads.

It’s hard enough scheduling time to mow your own typical suburban lawn of 10,000 square feet. Just imagine having to worry about maintaining more than 100 million square feet of vegetation along 1,800 miles of road stretching from Skykomish on the north to Enumclaw on the south and Vashon on the west.

“Our mowing schedule keeps us constantly busy from April through October,” says Maintenance Superintendent Tony Ledbetter. “It’s a combination of the sheer amount of roadside miles we have to maintain, the distances between unincorporated areas of the county, and a Northwest climate that really encourages plant growth.”

Keeping up with the mowing is important safety work for the Roads Division. Uncontrolled vegetation can impair sightlines for drivers, and as the summer progresses the dried out weeds and grasses become a fire hazard.

The maintenance section has 13 large mowers that have to be hauled out to sites on the back of a flatbed truck at the beginning of the mowing season or when they need repairs. They also have an assortment of smaller mowers, weed-eaters and hand-held equipment. Every spring, Ledbetter and his division supervisors work out a mowing plan that tries to balance safety with efficiency.


The large mowers have heads that are 4 to 6-feet wide, but most roadside areas still need more than one pass before vegetation is trimmed. Ledbetter says it takes more passes for mowable slopes and places where vegetation is thicker along the roadside. That’s why the maintenance section measures the work in “pass miles” – or, the amount of miles the individual mowers spend going up and down the side of the road. During the course of a typical summer, the maintenance section will rack up a total of 5,500 to 6,500 pass miles for all the mowers.

Summer is not just a time for mowing, it’s also when the maintenance section is sweeping roads, repairing ditches, re-grading gravel roads, vactoring out storm drains, prepping for roadway repaving, and patching potholes.

“You can't send a mower or sweeper out willy-nilly,” says Ledbetter. “You have to make sure everything gets done without spending all of your time mobilizing and demobilizing."

Since the mowing work is so labor intensive, it is costly. And, because many unincorporated roads are two-lane and narrow, the mowing operations often block traffic requiring flaggers to be present with the crew. It’s important that the work is scheduled in a route format to optimize the use of the equipment and the crew time, while minimizing disruptions for traffic.

“It’s great when people call us and tell us there is a problem area somewhere in the county where the vegetation is overgrown, but they sometimes don't understand why we can't just drop everything and hop over to that spot,” says Ledbetter. “If we did that each time we got a call, we'd get totally behind schedule.

“That's not to say we let things sit, though. If we have an intersection or sightline that’s being blocked and the mower isn't scheduled right away, we'll get the weed-eaters on the worst part until we get back with the big mower.”

To report a problem on a county road, call (206) 296-8100, or send an email.

 

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Updated:  August 06, 2008

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