
Whipps, Inc. is the market leader for high quality custom fabricated gates and water control equipment.
| Monday: | 8am – 5pm |
|---|---|
| Tuesday: | 8am – 5pm |
| Wednesday: | 8am – 5pm |
| Thursday: | 8am – 5pm |
| Friday: | 8am – 5pm |
| Weekend | Closed |
Looking for a modern alternative to traditional timber stop logs? The 500 Series Aluminum Stop Logs from Whipps, Inc. deliver lightweight handling, precise sealing, and long-term durability in ponds, tanks, channels, and other flow control applications. In continuous production since 1980, these stop logs represent a proven, cost-effective solution that eliminates the dimensional instability, leakage, and sourcing challenges associated with timber designs.
Each stop log is fabricated from 6061-T6 aluminum and fitted with UHMW seat/seals, ensuring predictable leakage rates of just 0.05 gallons per minute per linear foot of wetted seal. Logs are easy to install and remove, making them especially practical in applications where adjustments are infrequent. Whipps also offers multiple mounting arrangements and custom-engineered options, including corner stop log systems that use guideposts to extend or pivot.
The 500 Series includes three models tailored to different site conditions:
Model 509 – An aluminum stop log with an open channel design, ideal for narrower openings and moderate depths. Lightweight construction makes it especially easy to handle when operations are occasional.
Model 510 – A 6-inch-thick open channel log that delivers additional strength for wider channels and deeper water, while still maintaining manageable handling weight.
Model 511 – An 8-inch-thick log with a closed channel (square pipe) design, engineered for maximum strength and stiffness. Best suited for large openings and higher water depths where extra structural rigidity is critical.
With aluminum construction, precision machining, and decades of proven field performance, Whipps stop logs combine strength, efficiency, and reliability. From small pond applications to large-scale channel installations, the 500 Series Aluminum Stop Logs are a trusted choice for dependable, long-lasting water control.
The stop log, guide frames/grooves, and lifter shall be manufactured by a company with 10 or more years of experience in successfully designing and manufacturing low leakage stop logs under similar conditions. All welds will be executed by welders with AWS certification.
The stop logs maximum allowable leakage shall be 0.05 gallons per minute per linear foot of the wetted perimeter, regardless of the direction of the unbalanced head.
In addition to the submittal information required by other sections of these specifications, the stop log manufacturer may be required to submit design calculations and supporting data for all logs. The supplementary information depicts stresses, loads, and deflection for critical parts under design head conditions.
Crafted from 5/16” thick aluminum (Alloy 6061-T6) extrusions. Maximum bending stress shall not exceed 7600 psi at the maximum head. Each stop log will be designed to be identical and stacked in any order. Resilient lip-type seals are attached along the sides and across the bottom with stainless steel fasteners for easy inspection and replacement. An engraved aluminum tag is welded to each log, providing information about installation location and size of the log.
Stop log grooves and frames are constructed of extruded aluminum (Alloy 6061-T6), with stainless steel designs available. The frame is comprised of two grooves and an invert member. Stainless steel fasteners are supplied for mounting to a wall or to an existing cannel. The invert member is designed to minimize flow interference along the bottom of the channel.
The lifter is constructed using aluminum or stainless steel, featuring UHMW guide bars and stainless steel fasteners. Capable of both installing and removing stop logs, the lifter easily latches and unlatches with a lanyard operated by personnel.
All aluminum in contact with concrete shall receive a heavy shop coat of bitumastic paint.
All aluminum components can be anodized in accordance with Aluminum Association Specification AA-C22-A41. The anodizing shall be 0.7 mm thick with a nickel acetate sealer.




The 500 Series Stop Gates from Whipps, Inc. are a dependable, high-performance solution for water containment in ponds, tanks, channels, and other flow control structures. Designed for strength, reliability, and ease of use, these stop gates are a proven choice for operators who need effective water management without the complexity of larger gate systems. Built with robust aluminum or stainless steel construction, the 500 Series delivers long-lasting durability while remaining lightweight and easy to handle.
Our stop gates features precision-fabricated slides equipped with two welded handles, allowing operators to lift and position the gate manually. Thanks to its lightweight design, the gate can typically be installed or removed by one or two workers, making it well suited for applications where the gate is inserted and removed only occasionally. When not in use, the gate can be conveniently stored until needed again, ensuring flexible and efficient operation.
Whipps stop gates are engineered for durability and reliable sealing. All models incorporate ultra-high molecular weight polyethylene (UHMW) seat/seals, which provide a secure closure with minimal leakage of 0.10 gallons per minute per linear foot of wetted seal. This level of performance ensures consistent containment across a wide range of flow conditions while minimizing maintenance requirements. For added versatility, Whipps also offers stainless steel stop gates, designed for sites where additional strength and corrosion resistance are required to handle more demanding environments.
The aluminum models (501, 503, and 503-C) offer the ideal balance of rugged construction, corrosion resistance, and ease of handling. They are designed to perform reliably across a variety of flow control applications, from municipal systems and treatment plants to industrial facilities and irrigation structures. Combined with Whipps’ expertise in custom fabrication, the 500 Series Aluminum Stop Gates can be tailored to meet the exact needs of your installation, whether standard or specialized.
The stainless steel models (521, 523, and 523-C) deliver maximum strength, corrosion resistance, and reliable sealing performance for demanding applications. The 521 model is designed for permanent embedded installations, the 523 model offers flexible mounting options and other customizations, and the 523-C model provides a dedicated channel-mounted design for ease of operation and stability. Backed by Whipps’ precision fabrication and custom engineering, these stainless steel stop gates ensure dependable performance across municipal, industrial, and treatment facility installations.
Whipps, Inc.’s 500 Series Bulkhead Gates are built for heavy-duty performance in high head conditions and large waterways, combining rugged, reinforced construction with precision engineering. Available in aluminum (Models 519 and 519-C) or stainless steel (Model 529), these gates feature large extruded slides, resilient lip-type seals for reliable low-leakage performance, and frames designed with two grooves and an invert member to minimize flow interference. The 519 offers a durable aluminum design, the 519-C provides a channel-mounted aluminum option, and the 529 delivers maximum strength and corrosion resistance in stainless steel—making the series a versatile, long-lasting solution for demanding municipal, industrial, and treatment facility applications.
Supported by decades of engineering experience and precision manufacturing, Whipps, inc. 500 Series provide a reliable, cost-effective solution for water management. With their lightweight design, durable sealing system, and proven performance, our stop gates deliver the quality and dependability customers have come to expect from Whipps, Inc.
The stop gate will be manufactured by a company with 10 years or more of successful experience in designing and producing low-leakage stop gates under similar design conditions. All welds will be executed by welders with AWS certification.
The maximum allowable leakage for the stop gates shall be 0.10 gallons per minute per linear foot of the wetted perimeter, regardless of the direction of the unbalanced head.
In addition to the submittal information required by other sections of these specifications, the stop gate manufacturer may need to submit design calculations and supporting data for all gates, illustrating stresses, loads, and deflection for critical parts under design head conditions. At a minimum, theses shall include operating load, slide deflection, slide bending stress, and shear stress in stiffener welds.
Constructed of 1/4” or thicker extruded aluminum (Alloy 6061-T6) incorporating ultra high molecular weight polymer (UMHW) seat/seal facing on both the upstream and downstream sides of the slide. Each seat/seal is shaped to provide two bearing surfaces and two sealing edges. The gate side guides and invert shall weigh a minimum of 4lbs/ft for wall mounted and 3lbs/ft for embedded installation. The gate invert shall include a removable neoprene seal. Seals attached to the slide will not be acceptable. All necessary assembly and anchor bolts shall be type 304 (type 316 optional) stainless steel and provided by the gate manufacturer.
The slide shall be minimum thickness of 1/4” aluminum plate (Alloy 6061-T6) reinforced with stiffeners as required ensure that at the design head, the slide will not deflect more than 1/360 of its width and stress is limited to 7600 psi. Slide stiffeners shall have a minimum weight of 2.5lbs/ft. The slide shall be equipped with a cast aluminum offset lifting handle. Gates wider than 36 inches shall be provided with dual lifting handles.
All aluminum in contact with concrete shall receive a heavy shop coat of bitumastic paint.
All aluminum components can be anodized in accordance with Aluminum Association Specification AA-C22-A41. The anodizing shall be 0.7 mm thick with a nickel acetate sealer.


Stop Logs | Whipps, Inc.