Highway 99 Sewer South Replacement

An Important Investment in Hazel Dell’s Economic Future

Clark Regional Wastewater District replaced its sanitary sewer pipe along Highway 99, between NE 63rd Street and NE 78th Street, as part of a proactive effort to keep our sewer system operating safely and efficiently.

The existing sewer line, which is located along the eastern side of the road and serves adjacent businesses, was aging and needed replacement. The District’s proactive maintenance and asset management program identified the need to replace the existing pipe in order to ensure continued reliable service. The original pipe was installed in the late 1960s and has slowly deteriorated over time, requiring additional maintenance. This investment in new sewer infrastructure will provide continued reliable, efficient service for our Hazel Dell customers for another 50 years, while at the same time protecting public health and the environment.

Construction to replace the sewer pipe typically consists of digging a trench, laying pipe, backfilling, and paving. There will also be manhole installation, reconnection of sewer laterals to businesses, a segment of waterline replacement and other work. In most cases, work will be confined to the right hand northbound travel lanes and sidewalk. Temporary lane closures will occur in short segments along the corridor within the construction zone.

Careful planning has gone into this project to minimize loss of sewer service to businesses. To accomplish that, the new sewer pipe will be placed adjacent to the old, existing pipe, which will remain in operation during construction and then be abandoned. However, corridor businesses can expect moderate traffic impacts along with some noise, vibration and dust in areas under construction.

Construction Impacts

Careful planning went into this project to minimize impacts to local businesses and the public. To maintain sewer service for businesses, the new sewer pipe was placed adjacent to the old, existing pipe. The existing pipe remained in operation during construction and was then abandoned.

Planners expected moderate traffic impacts along with some noise, vibration and dust in areas under construction. Traffic revisions accommodated the construction work zone.

Traffic Impacts

During construction, Highway 99 was restriped within the project area in order to maintain four lanes of traffic and a center turn lane. The new striping pushed all lanes to the west and temporarily removed the bike lanes. Traffic was delayed at various times due to temporary sidewalk and lane closures. Flaggers were present to direct drivers.

Vehicular access to businesses was maintained during regular business hours. Driveway access was temporarily blocked in front of businesses with more than one driveway. The contractor provided businesses at least two business days’ notice prior to working in front of their driveway. In most cases, the contractor was in front of each business three times: first, to construct the sewer main (two to four days); second, to construct the sewer service lateral (a day); and third, to do final paving, concrete restoration and restriping (a day or less). Some areas required additional work. Any portions of driveways or sidewalks removed by construction were replaced.


Construction began in May 2016 and continued through October 2016. Not all areas were under construction at the same time. Work was done in stages.

Frequently Asked Questions

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The funding for this $2 million investment in our sewer infrastructure came from the District’s Replacement and Restoration (R&R) account, which is generated through customer rates. Our diligent financial planning allows us to maintain cash reserves to pay for projects such as the Highway 99 sewer replacement and still keep customer rates affordable. These types of investments keep our system operating efficiently and reliably, while at the same time protecting our health and environment. They also save money by preventing costly emergency repairs and sewer breaks.

Sump pumps will be used for minor dewatering; dewatering wells may be used for additional dewatering in some areas. Erosion control and stormwater pollution prevention is required at all times during construction.

There are a number of acts, policies, environmental reviews, and permit requirements being addressed during the design and construction phases of this project. These include:

  • Utility Permit
  • Clark County Right-of-Way Permit
  • Environmental Site Assessment Phase I & II

The District has no further capital work planned for this section of sanitary sewers. As new development or redevelopment occurs, additional work may be needed at that time to accommodate any new services.