Custom Cast Products
Heavy-Duty Drainage Grates: Custom Cast Iron & Steel Solutions
Engineered for decades of service, our drainage grates handle the heaviest loads and harshest environments — built to your exact specifications.
Drainage grates are one of the most critical — and most overlooked — components in stormwater management, roadway safety, and industrial site infrastructure. At C.L. Dews & Sons Foundry, we manufacture custom drainage grates from cast iron, ductile iron, and fabricated steel to meet the exact load ratings, opening dimensions, and corrosion-resistance requirements your project demands. Whether you need ADA-compliant trench grates for a commercial plaza or H-20 rated heavy-duty grates for a highway bridge deck, we cast and fabricate them in-house from pattern to finished product.
75+
Years of Foundry Experience
H-20
Max Load Rating Available
100%
Made in the USA
Types of Drainage Grates We Manufacture
Every drainage application has unique demands. We produce a full range of grate styles — each engineered for specific flow rates, load requirements, and installation environments. Whether you need a single retrofit grate or thousands of units for a municipal contract, we deliver to spec.
Trench Grates
Linear drainage grates designed for channels along driveways, loading docks, and pedestrian walkways. Available in heel-proof and ADA-compliant configurations with slip-resistant surfaces.
Heavy-Duty Road Grates
Rated for H-20 and HS-20 highway loading per ASTM A536 standards. Built from ductile iron to withstand constant heavy vehicle traffic without cracking or deflection.
Decorative Grates
Custom-patterned cast iron drainage grates for historic districts, parks, and architectural projects where appearance matters as much as performance. We match existing heritage patterns or create new designs.
Industrial Floor Grates
Chemical-resistant drainage grates for manufacturing plants, food processing facilities, and wash-down areas. Engineered with wide-slot openings for high flow rates and easy maintenance access.
Materials & Specifications
Material selection directly determines the service life and load capacity of your drainage grates. We work with you to match the right alloy and finish to your project conditions — from coastal saltwater to chemical wash-down environments.
Gray Cast Iron
The industry standard for municipal drainage grates. Excellent compressive strength, natural corrosion resistance, and cost-effective for medium-duty applications. Conforms to ASTM A48 Class 35B.
Ductile Iron
Superior tensile strength and impact resistance compared to gray iron. The preferred material for H-20 rated highway and airport drainage grates. Meets ASTM A536 Grade 65-45-12.
Fabricated Steel
Our steel fabrication shop produces welded bar grating and custom plate grates for heavy industrial environments. Hot-dip galvanized or epoxy-coated for long-term corrosion protection.
Coatings & Finishes
Bituminous coating, hot-dip galvanizing, epoxy lining, and powder coating options. We recommend coatings based on your exposure conditions — saltwater, chemical, or high-abrasion environments.
Applications
Our drainage grates are at work in municipalities, industrial facilities, and commercial developments across the country. Here is where they perform best — from city streets to chemical plants and pool decks.
Municipal & DOT
Curb inlets, catch basins, and stormwater conveyance systems for city streets, highways, and bridge decks. Load-rated for unrestricted traffic.
Industrial Sites
Chemical plants, refineries, power stations, and mining operations where drainage grates must resist corrosion, thermal stress, and heavy equipment loads.
Commercial Properties
Parking garages, retail plazas, airport tarmacs, and loading docks. ADA-compliant heel-proof designs keep pedestrian areas safe and accessible.
Residential & Landscape
Pool decks, driveway channels, and landscape drainage. Decorative patterns and smaller form factors that blend with residential architecture.
Why Choose C.L. Dews & Sons Foundry
In-House
Foundry
We pour iron and steel in our own facility — no outsourcing, no middlemen. Every drainage grate is cast, cleaned, and inspected under one roof.
Custom Engineering
Non-standard sizes, unique bolt patterns, retrofit frames — we manufacture to your drawings or engineer a solution from your requirements.
Certified Quality
Material test reports, dimensional inspection, and load testing available on every order. We meet ASTM, AASHTO, and local DOT specifications.
Ready to Specify Your Drainage Grates?
Tell us your load rating, dimensions, and material requirements. We will provide a detailed quote and lead time within 48 hours.
