Precast reinforced manholes have an unmatched reputation for their superior strength, durability, and hydraulics. Concrete is an inherently durable material. And unlike other structure types, concrete has increased strength over time.

Studies show that precast concrete manholes can last for more than a century. We feel they are the best option for a long-term solution.

Concrete manholes are not only durable but non-flammable and watertight under many different installation conditions. Manhole sections are produced for all wastewater structures and modern sewer systems. And just like precast reinforced concrete manholes, structural performance benefits of precast concrete utility holes include:

  • Concrete is inherently strong
  • Compression tests will verify the strength
  • Strength will be supported from the structure itself
  • Customized higher strengths are available

Product QualityManufactured Manhole by Columbia Precast Products

  • It has documented long-term quality material properties
  • Materials meet American Society for Testing and Materials (ASTM) standards
  • Quality assurance/control is verified on all aspects of precast concrete via physical tests of materials and the finished product

Superior Cost Benefits

We not only produce high-quality precast concrete manholes to your exact specifications, but we also do so in the most economical way possible. There is minimal field inspection and testing required, and they are proven to have a low life-cycle cost.

Wet Wells

Columbia Precast Products wet wells are available in various shapes, sizes, and styles. Including round, square and rectangular models in single or multi-level configurations. Additionally, they can be single, dual or multi-compartment. There are also a variety of custom options available.

Dry Wells

Columbia Precast Products manufactures dry wells for your drainage needs. We offer wells for light, medium and heavy-duty loading in various shapes and diameters.

Columbia Precast Products provides sealed manhole systems, built to specification to include a variety of features. Whether it is a complex job or a simple solution you need, our manholes will meet your expectations.

Why are Precast Manholes the Best Choice?

A Precast Manholes manufactured by Columbia Precast ProductsEngineers once used brick, clay, and cast-in-place concrete to build access points to sewers. These materials, while durable, require underground, on-site construction, a challenging and dangerous proposal.

Precast concrete sets the standard for utility holes. It’s the material of choice for both private and public construction projects. From a city street to a sewer drain, precast manholes are the best option for projects in Washington and Oregon.

We build precast concrete manholes in our Southwest Washington facility. In the controlled environment of our plant, we don’t contend with the uncertainties of Mother Nature. Installation for a completed manhole is relatively easy, which contributes to lower costs and completion.

Perfect Base

Precast channels at the base of the manhole make for easier transitions from sewer pipe to manhole to sewer pipe. This decreases the number of blockages throughout the line and makes for a more efficient line. These bases are built using exact specifications for easy installation and can be made in many configurations. Click here for more information about this product.

They’re Easy to Install

Imagine the difficulties of building a brick or poured-in-place concrete utility hole. Workers must labor for extended periods inside the trench. Soil compaction may complicate construction. Cold and wet weather can delay the work.

Precast concrete utility holes are, by comparison, much easier to install. Contractors use lifting devices and machinery. A minimal crew handles the installation.

Once the manhole is placed in the trench, workers can backfill immediately, completing the project. There’s no need to wait for the concrete or mortar to cure.

They’re Manufactured in Controlled Conditions

There is no doubt old brick or poured-in-place concrete utility holes that have stood the test of time. Their longevity is a testament to skilled engineers and builders. However, the quality of precast concrete is much more reliable.

Conditions in our facility are stringently regulated. We monitor temperature, humidity and other conditions that affect the curing of the material. That uniformity means we can make each precast concrete product to exact specifications.

They’re DurableConcrete Manholes Constructed by Columbia Precast Products

The consistency and durability of our materials give manholes the probability of a long life.

Precast concrete doesn’t relax or lose strength the way other materials can.

How long does precast concrete last? It’s hard to say for certain. Estimates are that it has a service life of 100 years.

We can customize products for enhanced durability under extreme conditions.

They Don’t Leak

Manholes must be able to endure rough conditions. They live underground, in dark, wet conditions, beneath roads and parking lots, allowing workers access to sewers and drainage systems.

To fulfill their function and protect the environment, they need to be watertight. Over the years, engineers have perfected designs, sealants, and gaskets to ensure precast concrete manholes won’t leak. We can test for water tightness in our plant, ensuring the quality of our products.

Manholes Products