An access opening in underground utility systems allowing workers to enter for inspection, maintenance, and repair of sewers, water mains, electrical systems, and buried infrastructure.

A manhole is an access opening in underground utility systems that allows workers to enter for inspection, maintenance, and repair of sewers, water mains, electrical systems, and other buried infrastructure. These essential access points provide safe entry to underground spaces while maintaining surface integrity and traffic flow. Manholes are critical components of urban infrastructure, enabling ongoing maintenance and operation of buried utility systems that serve communities.

The primary purposes include providing safe access to underground utility systems, enabling inspection and maintenance of buried infrastructure, allowing repair and modification of underground systems, supporting emergency response and system troubleshooting, facilitating installation and connection of new services, meeting regulatory requirements for utility access, and ensuring long-term system reliability and performance.

Types and applications involve sewer manholes, water system manholes, electrical manholes, and telecommunications manholes for different utility systems.

Fun Fact: The first manholes were built in Paris in the 1850s for the city’s revolutionary sewer system! Modern manhole covers can weigh over 300 pounds and are designed to support loads exceeding 125,000 pounds. Some manholes in major cities are over 100 years old and still in service. Interestingly, manhole covers are round because a round cover cannot fall through its own opening, regardless of how it’s positioned!