Embankment Slides 101: A Guide to Designing Safe, Fun, and Compliant Hillside Slides

Few playground features create as much excitement as an embankment slide. By transforming natural hillsides into memorable play experiences, embankment slides help schools, parks, and communities maximize existing terrain while creating destination play spaces that families remember. However, successful projects start with thoughtful planning, site analysis, and a clear understanding of playground safety standards. Why Choose an Embankment Slide?

• Create a unique playground feature without extensive grading

• Transform underused hillsides into play destinations

• Encourage active outdoor play

• Blend naturally with the surrounding landscape

• Provide memorable experiences for children of all ages

What Information Do You Need Before Designing an Embankment Slide?

The success of an embankment slide starts with understanding the site. Before selecting a slide or beginning design work, gather:

• A site plan with topographic information (topographic contour lines are preferred)

• Elevation at the top of the hill where the slide will begin

• Elevation at the bottom of the hill where the slide will exit

• Soil conditions and site constraints

These details help determine the slide length, slope angle, accessibility considerations, and installation requirements.

Embankment Slide vs. Elevated Embankment Slide

One of the most important distinctions in hillside slide design is understanding whether the slide qualifies as a true embankment slide.

According to the CPSC Public Playground Safety Handbook, an embankment slide follows the contour of the ground and the bottom of the slide chute must remain within 12 inches of the surrounding grade throughout its length.

Embankment Slide

• Slide follows the natural terrain.

• Bottom of the chute stays within 12 inches of grade.

• Protective surfacing is generally not required beneath the slide bedway.

• Designers can integrate landscaping, planting, and naturalized features alongside the slide as long a 22” clear is met on both sides of slide chute.

Elevated Embankment Slide

• Slide bedway exceeds 12 inches above grade.

• Protective surfacing is required beneath the slide.

• Additional safety requirements apply, including exit-use zones.

Understanding this distinction early can significantly impact both project costs and design flexibility.

Understanding Slope: Degrees vs. Percent Grade 

Landscape architects and civil engineers often describe hills using either degrees or percent slope.

Percent Slope Formula:

% Slope = (Rise ÷ Run) × 100

For example:

• 5 feet of rise over 9.25 feet of run equals approximately 54% slope. 

When evaluating a hillside for a slide, it is important to know both the slope percentage and the angle in degrees, since slide manufacturers and safety standards often reference slide angles rather than percent grades. The best way to make sure your slide grade is perfect is to select a slide with a build in base, like UPC Rocks and Ropes with Simple set base. Click here to find out more!

What Is the Best Angle for an Embankment Slide?

A slide must be both safe and enjoyable.

The ideal design target is:

• 30–45 degrees for a fun sliding experience 

• Average angle of approximately 30 degrees

  

• Maximum angle of 50 degrees at any point according to CPSC and ASTM guidance

Slides that are too shallow may not provide an enjoyable ride, while slides that are too steep can create safety concerns and compliance issues.

Understanding Slide Exit Zones

Proper exit-zone design is critical for user safety.

Key requirements include:

Side Clearances

• Minimum 21 inches of clear space on each side of the slide.

Exit Use Zone

• Minimum 6-foot fall zone beginning at the slide exit.

• Maximum 8-foot clear zone at the end of the slide.

Protective Surfacing

• Impact-attenuating surfacing within the exit zone should have a critical height rating of at least 48 inches.

  
  

Designers should also ensure that landscaping, rocks, logs, or site furnishings do not intrude into required clearances.

Choosing the Right Slide Material

The material selected for an embankment slide affects cost, maintenance, accessibility, and user experience.

Plastic Slides

Plastic slides are often the most economical option and can incorporate twists and turns to extend slide length on large hillsides. However, static electricity generated during use may interfere with cochlear implants, making plastic a less desirable option for some inclusive play environments.

Concrete Slides

Modern concrete embankment slides are very different from the rough concrete slides common in the 1970s. Today's prefabricated concrete slides feature smooth, polished surfaces that provide excellent ride quality without requiring wax paper or cardboard. Manufacturers such as UPC Rocks and Ropes offer custom concrete solutions that integrate naturally into hillside designs. They have also incorporated ADA transfers into the slides to allow everyone to play!

Steel Slides

Steel slides offer durability and custom design flexibility but should be carefully considered in warmer climates. They perform best in:

• Cooler regions

• Shaded locations

• North-facing orientations that reduce solar heat gain

  

Simplifying Installation with Pre-Engineered Solutions

Some manufacturers offer "Simple Set" slide systems that eliminate much of the complexity associated with custom hillside construction.

Benefits include:

• Pre-engineered support systems

• Simplified footing requirements

• Proper slide angle built into the design

• Reduced installation time and cost

• Improved compliance with playground safety standards

These systems can be especially valuable when site conditions are challenging or project schedules are tight.

Lessons Learned from Real Projects

Understand Soil Conditions

A large custom slide may perform well on stable soils but create challenges in sandy environments. For example, coastal sites with sandy soils may require additional engineering and stabilization measures.

Plan for Installation Logistics

Custom slides are often shipped as large prefabricated components. Depending on size and access, cranes may be required for installation. These costs and site access requirements should be considered early in the design process.

Coordinate Early

Complex embankment slide projects often require collaboration among:

• Landscape architects

• Civil engineers

• Playground manufacturers

• Contractors

Early coordination helps avoid costly redesigns and ensures safety standards are maintained throughout the project.

Watch Clearance Zones Carefully

Custom features such as rocks, logs, bumps, and natural play elements can enhance a slide experience, but they must never encroach into required safety clearances or raise portions of the slide above allowable heights. When designed correctly, embankment slides provide years of reliable performance with minimal maintenance. Selecting the appropriate material, understanding site conditions, and planning installation early can help reduce long-term maintenance needs while protecting your investment.

Final Thoughts

Every hillside is unique. Evaluating terrain, accessibility, drainage, safety standards, and installation logistics early in the planning process helps avoid costly changes later and results in a safer, more successful project. An embankment slide and embankment play can become the signature feature of a park, school, or destination playground. The key to success is understanding the site, designing within ASTM and CPSC guidelines, selecting the right material, and coordinating installation requirements from the beginning.

When properly designed, embankment slides blend seamlessly into the landscape, encourage active play, and create a unique experience that children will remember for years to come. Looking to incorporate an embankment slide into your next playground project? Whether you're planning a new park, renovating a school playground, or designing a destination play space, our experienced team can help evaluate your site, recommend the right embankment slide solution, and guide your project from concept through installation. Contact us today to bring your hillside playground vision to life!