HMA

Hot Mix Asphalt also known as Asphalt Overlay

 

HMA 2020

This surface treatment is for structural reinforcement on arterial and collector roads in both urban and rural areas. The depth of an overlay is between 1 and 4  inches.

Surface defects and irregularities are repaired prior to adding a new layer of hot mix asphalt.

In some instances, a thin layer of asphalt is applied to subdivision or access roads that have surface irregularities but remain structurally sound.

This paving, known as a thin lift, evens the road surface and corrects some drainage issues. It provides a more modest treatment on less heavily used roads than a standard overlay.

There are some driver delays with asphalt overlays. Flaggers typically can guide vehicles through the construction zone without fully closing the road.

2022 Project Locations

 

Name

BMP

From

EMP

To

HMA 1

Rosewood Drive

0.19

NE 114th Avenue (Van CL)

0.32

211' NE of NE 110th Avenue (Van CL)

0.36

211' NE of NE 110th Avenue (Van CL)

0.49

NE Covington Road

HMA 2

NE Crown Road

2.71

0.13 miles S of NE McKever Road

3.33

Camas CL

HMA 3

NE 50th Avenue

0.00

NE 119th Street

1.53

NE Salmon Creek Street

HMA 4

NE 72nd Avenue

6.27

NE 179th Street

7.27

NE 199th Street

HMA 5

NE 76th Street

 

0.12 Miles North of 68th Street

 

NE Ward Road

HMA 6

NE Ward Road

0.06

0.05 miles N of NE Fourth Plain Blvd

0.99

NE Padden Parkway

HMA 7

NE 217th Avenue

 

NE 68th Street

 

0.12 Miles North of 68th Street

 

 

Micro seal

Micro seal is similar to a slurry seal, only that it uses larger pieces of rock. Cement also can be added to the mixture. A micro seal dries faster than a slurry seal and is used on multilane roads, which allows traffic to pass on one lane while the other is being treated.

To further ease traffic disruptions, sand can be shoveled onto intersections so vehicles can drive over the treated surface only minutes after it has been applied.

 

Vegetation.jpg

Vegetation trimming

In preparation for summer road work, residents sometimes need to prune their vegetation so construction vehicles can get close to the curb.

In addition, vegetation needs to be trimmed to improve traffic visibility and remove sidewalk or pedestrian obstructions.

Homeowners are responsible for pruning and maintaining their vegetation, including debris disposal.

All low-hanging material needs to be trimmed to provide 14 feet of vertical clearance from the top of the curb and 8 feet of clearance from the full width of the sidewalk.

Bushes, shrubs and other low vegetation also need to be trimmed so they don’t hang into the street.

If residents do not trim their vegetation, county road crews will cut it. This work will be done for free, but it will not be done to a landscape quality desired by many residents.

For this reason, residents are encouraged to trim their vegetation.