Manholes and Grade Rings


Precast concrete manholes are an integral component of any modern storm and sanitary sewer system. A properly designed and installed precast concrete manhole system provides superior watertight performance compared with competing methods and materials. Manholes are made to accommodate any size pipe and engineered to withstand highway traffic, and other load requirements.

Idaho Precast manufactures round manholes with inside diameter dimensions ranging in sizes 48”, 60”, 72” and 96”. We are also able to produce 144” inside diameter manholes. These are designed as a per project basis and not a stocked item. Contact us for more information on these. We offer a wide range of riser heights, base options, various concrete lid options, cast iron rings and covers and/or galvanized steel grates, access steps, rubber boots and joint sealants. Our precast manholes are designed to meet ASTM C478”.

Choose a diameter dimension that’s right for you:

 


 

48″ INSIDE DIAMETER MANHOLE

PICTURE PRODUCT NAME DIMENSIONS SPEC SHEET
Eccentric Cone 48″ x 24″ Tall
48″ Mono Channeled Base 48″ x 18″ Tall
48″ Diameter Manhole Barrel Section 48″ x 12″ – 48″ Tall
2 Ft Eccentric Cone for 48″ Manhole 48″ x 24″ Tall
3 Ft Eccentric Cone for 48″ Manhole 48″ x 36″ Tall
2 Ft Concentric Cone for 48″ Manhole 48″ x 24″ Tall
3 Ft Concentric Cone for 48″ Manhole 48″ x 36″ Tall
Concentric lid for 48″ manhole, stacks 6″ w/ 24-1/2″ hole 8″ Thick
Eccentric Lid for 48″ manhole, stacks 6″ w/ 24-1/2″ hole 8″ Thick

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60″ INSIDE DIAMETER MANHOLE

PICTURE PRODUCT NAME DIMENSIONS SPEC SHEET
60″ Diameter Manhole with 12″ Base 60″ x 24″ – 60″ Tall
60″ Diameter Manhole Barrel Section 60″ x 24″ – 72″ Tall
Eccentric Lid for 60″ Manhole 8″ Thick
Concentric Lid for 60″ Manhole 8″ Thick

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72″ INSIDE DIAMETER MANHOLE

PICTURE PRODUCT NAME DIMENSIONS SPEC SHEET
72″ Diameter Manhole with 12″ Base 72″x 24″ – 60″ Tall
72″ Diameter Manhole Barrel Section 72″ x 24″ – 72″ Tall
Eccentric lid for 72″ Manhole 12″ Thick
Concentric Lid for 72″ Manhole 12″ Thick

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96″ INSIDE DIAMETER MANHOLE

PICTURE PRODUCT NAME DIMENSIONS SPEC SHEET
Base Slab for 96″ Manhole Section 12″ Thick
96″ Diameter Manhole Barrel Section 96″ x 24″ – 72″ Tall
Eccentric Lid for 96″ Manhole 12″ Thick
Concentric Lid for 96″ Manhole 12″ Thick

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GRADE RINGS

PICTURE PRODUCT NAME DIMENSIONS SPEC SHEET
Precast Grade Rings Varies

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