Project Archive

Concrete box culvert being installed in desert landscape

Trinity 8’x4′ Box Culvert

Stormwater Management, Infrastructure

This new residential development in Lake Havasu, Arizona, is expanding its roadway access and stormwater infrastructure with 360 LF of 8’x4’ reinforced concrete box culvert (RCB) by Geneva Pipe and Precast.

Box Culverts
Steel pipe in field

Integrated Pipeline (IPL) Segment 19-1 Long Tunnel Crossings

Water Transmission, Trenchless

Part of the 150-mile Integrated Pipeline (IPL) system, this project traverses beneath multiple highway, railroad, utility, and waterway crossings, connecting a high-capacity water transmission pipeline that delivers dependable water supplies to the growing North Central Texas region. NWP is supporting this project with 45,000 LF of 84-inch engineered steel carrier pipe.

Engineered Steel Water Pipe, Permalok Steel Casing Pipe
Installation of steel pipe in trench

Rocky Boy’s North Central Montana Regional Water System

Water Transmission

The Core System of this project carries treated water from a new water treatment plant to residents of the Rocky Boy’s Reservation over 50 miles east. Northwest Pipe Company manufactured over 38 miles of 30- and 36- spiralweld steel pipeline to support this water transmission project.

Engineered Steel Water Pipe

NW Outfall Siphon Rehabilitation

Rehabilitation, Sanitary Sewer

Concrete corrosion caused by caustic gases in wastewater flow is the catalyst for this sanitary sewer rehabilitation project in Pima County, Arizona, which replaces deteriorating inlet and outlet structures with fully lined, corrosion-resistant precast structures by Geneva Pipe and Precast.

Perfect Lined Manhole System, Perfect Pipe
Crane lifting lined RCP into trench

950 N Sewer Trunkline

Sanitary Sewer

The Central Davis Sewer District is expanding its sanitary system with 3,400 LF of corrosion-resistant Perfect Pipe (HDPE-lined RCP), ensuring a long-lasting and durable wastewater solution for the growing community in Davis County, Utah.

Perfect Pipe

Great Lakes Water Authority 96-inch Water Transmission Main Relocation Project–Phase 1

Water Transmission

The Great Lakes Water Authority is constructing a new 96-inch water transmission main utilizing engineered spiralweld steel pipeline. Phases I and II of the project are manufactured by Northwest Pipe Company. The new welded steel water main will reroute a 2.3 mile stretch of pre-stressed concrete cylinder pipe (PCCP) to provide better access for future operations and maintenance of the system.

Engineered Steel Water Pipe

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