Mark Twain National Park's Big Springs facility learned the hard way that NEMA 3R and NEMA 4 enclosures aren't designed for submersion. After repeated flood damage destroyed lift station controls across seven locations, the park faced a critical decision: continue costly repairs after every storm, or invest in truly submersible protection.
They chose NEMACO™'s engineered NEMA 6P (IP68) submersible enclosure system—and haven't lost a single electrical panel since installation.
Big Springs Park, Mark Twain National Forest103 State Highway Z, Van Buren, MO 63965Southeast Ozark Mountains region
The Ozark Mountains' rocky, non-porous terrain creates dangerous flash flooding conditions. Rain doesn't absorb—it runs off rapidly, overwhelming valleys and low-lying infrastructure within minutes.
What was failing:
Standard outdoor enclosures are designed for rain and snow—not full submersion. The park needed engineered submersible solutions rated for prolonged underwater operation.
NEMACO™ was selected based on three critical capabilities:
Standard NEMA 6P enclosures face a critical limitation: gasket width. Single-piece cut gaskets provide superior sealing but restrict maximum door width.
NEMACO™'s solution:
Front and rear access doors with independent gasketed sealing systems.
Benefits:
Waterproof Integrity:
Interior Layout:
Installation Features:
Quality Assurance:
Interior dimensions: 60"H × 36"W × 36"D
Configuration: Dual-access front/rear doors
Mounting: Four 12" floor-mount legs
Conduit entry: Bottom-only via welded NPT hubs
Rating: NEMA 6P / IP68 submersible
Testing: Verified at 15 ft depth for 24 hours
This model represents one of seven custom-engineered enclosures deployed across the Big Springs lift station network. Each enclosure was dimensioned specifically for its electrical load requirements and site conditions.
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NEMACO™ worked directly with:
This collaboration refined enclosure dimensions for optimal equipment fit and simplified field installation.
Each unit shipped with:
Since installation, Big Springs lift stations have weathered multiple flood events—with zero water intrusion incidents.
Operational benefits:
The NEMA 6P enclosure investment delivers:
Standard carbon steel or aluminum enclosures corrode rapidly when submerged. 316 stainless steel provides maximum corrosion resistance in wet, chemically-exposed environments—critical for long-term reliability.
For applications requiring large interior workspace, dual-access design allows wider enclosures while maintaining single-piece gasket sealing performance.
NEMACO™ specializes in engineered submersible enclosure solutions for mission-critical infrastructure. With in-house design, fabrication, and testing capabilities, we deliver custom NEMA 6P/IP68 enclosures that protect electrical systems in the harshest environments.
Core capabilities:
Contact NEMACO™ to discuss your submersible enclosure requirements. Our engineering team will work with you to design, test, and deliver waterproof solutions that perform when standard enclosures fail.
Project Completed: January 2026
Location: Mark Twain National Forest, Van Buren, Missouri
Application: Lift station electrical protection
Enclosures Deployed: 7 custom NEMA 6P units
Performance: Zero failures through multiple flood events
Mark Twain National Park's Big Springs facility learned the hard way that NEMA 3R and NEMA 4 enclosures aren't designed for submersion. After repeated flood damage destroyed lift station controls across seven locations, the park faced a critical decision: continue costly repairs after every storm, or invest in truly submersible protection.
They chose NEMACO™'s engineered NEMA 6P (IP68) submersible enclosure system—and haven't lost a single electrical panel since installation.
Big Springs Park, Mark Twain National Forest103 State Highway Z, Van Buren, MO 63965Southeast Ozark Mountains region
The Ozark Mountains' rocky, non-porous terrain creates dangerous flash flooding conditions. Rain doesn't absorb—it runs off rapidly, overwhelming valleys and low-lying infrastructure within minutes.
What was failing:
Standard outdoor enclosures are designed for rain and snow—not full submersion. The park needed engineered submersible solutions rated for prolonged underwater operation.
NEMACO™ was selected based on three critical capabilities:
Standard NEMA 6P enclosures face a critical limitation: gasket width. Single-piece cut gaskets provide superior sealing but restrict maximum door width.
NEMACO™'s solution:
Front and rear access doors with independent gasketed sealing systems.
Benefits:
Waterproof Integrity:
Interior Layout:
Installation Features:
Quality Assurance:
Interior dimensions: 60"H × 36"W × 36"D
Configuration: Dual-access front/rear doors
Mounting: Four 12" floor-mount legs
Conduit entry: Bottom-only via welded NPT hubs
Rating: NEMA 6P / IP68 submersible
Testing: Verified at 15 ft depth for 24 hours
This model represents one of seven custom-engineered enclosures deployed across the Big Springs lift station network. Each enclosure was dimensioned specifically for its electrical load requirements and site conditions.
NEMACO™ worked directly with:
This collaboration refined enclosure dimensions for optimal equipment fit and simplified field installation.
Each unit shipped with:
Since installation, Big Springs lift stations have weathered multiple flood events—with zero water intrusion incidents.
Operational benefits:
The NEMA 6P enclosure investment delivers:
Standard carbon steel or aluminum enclosures corrode rapidly when submerged. 316 stainless steel provides maximum corrosion resistance in wet, chemically-exposed environments—critical for long-term reliability.
For applications requiring large interior workspace, dual-access design allows wider enclosures while maintaining single-piece gasket sealing performance.
NEMACO™ specializes in engineered submersible enclosure solutions for mission-critical infrastructure. With in-house design, fabrication, and testing capabilities, we deliver custom NEMA 6P/IP68 enclosures that protect electrical systems in the harshest environments.
Core capabilities:
Contact NEMACO™ to discuss your submersible enclosure requirements. Our engineering team will work with you to design, test, and deliver waterproof solutions that perform when standard enclosures fail.
Project Completed: January 2026
Location: Mark Twain National Forest, Van Buren, Missouri
Application: Lift station electrical protection
Enclosures Deployed: 7 custom NEMA 6P units
Performance: Zero failures through multiple flood events
