Northwest Pipe Company

Bar-Wrapped pipe manufactured in in accordance with AWWA Manual M9 offers rugged durability, minimal maintenance, and a long service life—all which adds up to an excellent value. Principally used in the transmission and distribution of water in municipal, industrial, and agricultural systems, as well as the conveyance of seawater and sewage in force mains, CCP is a lightweight pipe with bottle-tight joints available in a variety of configurations.

Catch basins and inlets are a key component of underground drainage systems. Catch basins, a term specific to municipal maintenance, refer to curb inlets, which prevent flooding and convey stormwater. Most catch basins consist of a below-ground box or cylinder topped with a grate. Precast catch basins are resilient, durable, and widely used across North America, and meet DOT specifications. With a proven 100-year service life, precast concrete catch basins are a long-term solution for stormwater and drainage. Our engineers will team with you to manufacture basins and inlets that are site-specific shape, size, and configuration to create a quality performing solution.

Power and Communications Vaults by NWPX Geneva are durable precast concrete structures built to meet the unique needs of underground electrical and communications infrastructure. Designed to securely house power cables, fiber-optic lines, transformers, switchgear, and junction equipment, our vaults support a wide range of dry utility applications. NWPX Geneva supplies PacifiCorp-approved electrical padvaults for projects within Pacific Power and Rocky Mountain Power service territories, helping engineers, contractors, and project owners meet utility requirements while simplifying the specification, design, and approval processes. Manufactured in a controlled factory environment at NPCA-certified plants, NWPX Geneva precast concrete power and communications vaults are built for long-term performance under demanding site conditions. Our vaults are constructed of steel reinforced concrete and available in standard and custom sizes to accommodate specific equipment dimensions, access requirements, and utility configurations. Options include traffic-rated access hatches, lockable lids, ventilation, waterproofing, fire protection, grounding and shielding systems, and seismic or wind-load considerations. All vaults are produced in accordance with applicable ASTM and AASHTO standards and are designed to support NEC and CEC compliance for electrical utility installations.

We custom design and produce each box culvert individually for your project and fabricate with a precise mix of welded wire reinforcing and triangular haunches to back project loading. Our NPCA-certified plants located in Utah manufacture in both dry cast and wet cast methods. All fabrication assures quality control and dependable structural integrity that exceeds concrete strength requirements and governing standards. We produce countless variations of box culvert designs with sizes and optional custom features as small as 3’ span and 1’ rise to as large as shipping allows. We will team with your engineers to produce long span box culverts up to 24’. Custom appurtenances such as skewed sections, wyes, tees, and end sections can include wing walls, head walls, aprons and cutoff walls. Box culverts are extremely versatile and in any construction application, provide proven strength, durability, and performance. Pairing these benefits with additional precast features including quick installation, long service life, and improved life cycle cost, the end product provides an ideal solution for many projects. Common use includes diverting a watercourse; road crossings for animals, pedestrians, vehicles, railways or utilities; water or other product and material storage, and tunnels.

We manufacture each vault to customer specifications in a quality-controlled factory environment that ensures optimum performance. Our plants meet rigid production and testing specifications for all federal, state and local standards, including ASTM and ASSHTO specifications. Precast concrete vaults are essential in underground utilities placement. The five-sided hollow structures with access lid protect and provide access to critical connections and controls for electrical, gas, steam, water, and fiber optic and telecommunication systems. The non-combustible vaults maintain structural integrity during fire and, because of their weight, resist disruption due to changes in groundwater. They can be set in place and backfilled with minimal time and effort—eliminating excessive labor required by traditional cast-in-place methods. We manufacture custom vaults and large precast structures in a variety of configurations to meet any unique project requirements. Specific to Intermountain West Region, we manufacture certified electrical padvaults for Rocky Mountain Power and incorporate all of PacifiCorp’s standard vault configurations into custom designed vaults and pads.

Our precast concrete manholes are available in many sizes and install quickly on the jobsite. With numerous design options, we manufacture our precast manhole sections as wet wells, junction structures for pipe and vaults for water valves. NWPX Geneva meets the needs of most sanitary sewer and storm drain systems specifications with manhole in sizes from 48” to 120”. All are designed to meet the varying load requirements required by highway, aircraft, and railroad specifications and offers invert channels, flexible pipe to manhole connections, custom hole openings, and custom lids. Our manhole units are easy to install, but even more importantly, provide safe access and entry into storm drainage and sanitary sewer systems. Work in these confined spaces can be challenging and hazardous. Our manhole systems provide necessary structural integrity that will keep your sewer and storm drain system and employees safe for decades to come.

Reinforced Concrete Pipe (RCP) marries the best features of concrete and steel, with the concrete pipe managing compressive forces while the steel cages provide tensile strength. RCP has a proven long service life and offers resiliency and sustainability that make it a classic choice for water transmission, sanitary sewer systems and storm drainage. Its high-load capacity supports both dead loads and live loads above. We manufacture RCP in sizes 12” through 96” in a variety of strength classes. This durable, easy-to-install pipe is an excellent choice for both shallow and deep projects. In addition to the traditional RCP we also produce RCP for microtunneling and jacking as well as Elliptical Concrete Pipe.

The patent-pending Permalok® Radial Bending Joint (RBJ) enables steel pipe to be installed along a curved radius in microtunneling applications. This innovative technology represents a groundbreaking advancement in trenchless construction and a first in the industry. Permalok® steel pipe is most often used as a casing pipe for utilities and excels in trenchless jacking applications. The press-fit machined joints reduce field time by eliminating the need for butt-weld joints. The RBJ provides the same reliability, unparalleled speed, and consistency as our other Permalok® joint designs, with the added flexibility of installing along a curve.

The Permalok® HDD Joint is a direct push system specially designed to optimize Horizontal Directional Drilling (HDD) operations. Typically, an HDD set-up requires a substantial footprint, including a rig/operating area, reception area, and a stretch of open land for laying out the pipe string. The cost of equipment, including rollers, cranes, and excavators, as well as the labor to operate them, quickly add up. Our HDD joint eliminates the need for pipe string-out, reducing the project footprint and associated construction costs. Utilizing direct push to engage joints rather than the pull technique traditionally used in HDD applications, the Permalok® HDD system quickly and easily installs using existing equipment, and without the need for welding. It can be pushed from the shoreline or beach without the need for additional water crews or specialized tools. Our HDD joint provides the same allowable bend radius as a standard HDD installation (100 ft/OD in per ASC MOP 108). Engineered with the precision and durability guaranteed in all Permalok® products, our HDD joint offers a high-quality and cost-effective piping solution for even the most challenging HDD applications. Award-Winning Innovation The Permalok® HDD Joint has earned multiple industry honors, including NASTT’s Innovative Product of the Year. It was also featured in Trenchless Technology’s Project of the Year – New Installation for its role in the Champlain Hudson Power Express Project, where it was successfully installed in a 5,200-linear-foot dual crossing beneath New York City’s East River.

Permalok® Steel Casing Pipe excels in trenchless jacking construction applications including microtunneling and pipe jacking, auger boring, pipe ramming, and others. Our precision machined joint reduces field time by eliminating butt-weld joints, resulting is a shortened tunneling duration and reduced field costs. Permalok offers the strength and durability of steel piping with a variety of coating options. With over 4,000,000 feet of pipe successfully installed in the past 25 years, Permalok® stands as the product of choice for trenchless contractors and engineers on their most challenging and significant projects.

In areas prone to geohazard conditions, such as differential settlement or high seismic activity, resilient water infrastructure is paramount to ensuring a reliable supply of clean and safe water for communities and first responders. The InfraShield® Joint System by Northwest Pipe Company is a patented Geohazard Resistant Steel Pipe (GRSP) solution designed to effectively strengthen the resilience of steel pipelines and keep water flowing in these vulnerable geological areas. Manufactured in the USA and backed by rigorous testing, InfraShield® is a fully welded, easy-to-install system that offers reliably leak-free performance and significant cost savings.

Composite FRP Rehab Panels by NWPX Geneva are easy to install and maintenance-free. The panels are ideal for rehabilitating existing large wastewater structures as well as for providing a corrosion-resistant lining to new structures, extending the service life by decades. Our Composite FRP Panels consist of a PP honeycomb core with polyester fleece backing and a thick outer layer of corrosion-resistant FRP. The panels come pre-drilled and ready to be mechanically fastened to the walls of an existing concrete structure. Once the panels are securely mounted, the void between the panels and the walls is filled with high-strength grout to provide additional strength to the system. Seams between the panels and all fastener heads are sealed in a three-step process by qualified applicators providing seamless protection from the corrosive environment of hydrogen sulfide gases.

The Hybrid PVC Manhole System combines the corrosion and abrasion resistance benefits of traditional lined manholes with the ease of installation and the widespread availability of industry-standard PVC pipes. This system offers a simple, cost-effective, modular design that meets all structural and corrosion resistance requirements for use in municipal sewer systems throughout North America. It is available for both new construction and rehabilitation projects and comes with a 10-year warranty and 100-year design life. Each Hybrid PVC Manhole System includes an FRP-lined reinforced concrete base and lid and a PVC riser, complete with a preinstalled ladder. Installation is quick and easy, and labor can be 100% self-performed in the field.

Perfect Lined Manhole is a reinforced precast concrete manhole that meets ASTM C478 and is lined with high-quality synthetic polymer liner, which protects the concrete from Microbial Induced Corrosion (MIC) when exposed to municipal and industrial wastewater. The entire structure of the monolithic manhole base including the wall, channel, berm, and the pipe connections are reliably leak-proof. The smooth change in the angle and slope of all channels and pipe connections provide ideal flow properties and prevent deposit build-up. The custom invert channels accommodate pipe of any configuration or size. After installation, the Perfect Lined Manhole is easy to maintain and provides a high load-bearing capacity under static and dynamic loads. Setting a new quality standard for surface drainage and wastewater systems, the Perfect Lined Manhole System is available in standard sizes ranging from 48” up to 120” diameter.

Concrete-HDPE composite Perfect Pipe is revolutionizing municipal wastewater systems with proven performance in traditional sewers, trenchless projects, and high water table applications.