How Dallas, Texas built a splash pad on a freeway cap-park constructed over a sunken downtown freeway
A composite parks-and-transportation case study of a major Texas city that constructed a deck-park over a sunken downtown freeway and built a marquee splash pad as the cap-park's family-anchor centerpiece.
Summary
A major Texas city constructed a $112M deck-park over a sunken downtown freeway and built a $2.8M marquee splash pad as the cap-park's family-anchor centerpiece. Funded through a public-private capital stack combining transportation appropriations, federal placemaking grants, a regional foundation lead gift, and a substantial private capital campaign, the pad sits on a structural deck spanning eight lanes of active highway below. First-summer attendance reached approximately 215,000 visits, the cap-park has become a national reference for highway-removal-style placemaking, and the splash pad has anchored the broader project's family-programming strategy.
Key metrics
Background: a sunken freeway, a divided downtown, and the cap-park solution
Dallas's downtown had been bisected since the 1960s by a sunken eight-lane freeway running through the city's core, separating the central business district from the Dallas Museum of Art, the Arts District, and adjacent residential neighborhoods. The freeway itself was unmovable — too central to the regional transportation network to relocate or remove — but the sunken alignment created an opportunity that comparable elevated freeways do not offer. By constructing a structural deck over the highway, the city could create a 5.2-acre downtown park stitching the divided urban fabric back together. The Klyde Warren Park project advanced through two decades of planning, funding, and construction before opening in 2012. By the early 2020s the park had matured into a beloved civic asset, and a planned-from-the-start expansion phase included a marquee splash pad as the family-anchor centerpiece. The decision to build a splash pad on a structural deck spanning active highway lanes below required engineering rigor that no conventional pad project had previously demanded.
Structural engineering on a deck spanning active freeway lanes
Building a splash pad on a freeway-cap deck required structural engineering far beyond standard inland projects. The deck itself was originally engineered for live loads associated with general park use, vegetation, and pedestrian crowds. Adding a splash pad introduced new loading scenarios: standing water, hydrostatic pressure during operations, mechanical equipment, and concentrated foundation loads at feature-mount points. The structural-engineering firm worked with the original deck designer to verify that the as-built deck capacity could absorb the new loading without retrofit, and identified one zone requiring localized reinforcement to support the pad's mechanical-room concentrated loads. Drainage engineering proved equally complex: water from pad operations had to be captured, treated, and either recirculated or discharged through deck drainage infrastructure designed for stormwater rather than continuous water-feature operation. The mechanical room sits in a dedicated below-deck vault accessible from a discreet maintenance entry, and all penetrations through the deck were detailed for waterproofing performance under repeated thermal and load cycling. The engineering review and detailing added roughly nine months to the project timeline relative to a conventional pad.
Funding stack and the public-private capital structure
The $2.8M splash-pad budget came from a four-source funding stack consistent with the broader cap-park's public-private model. The largest contribution, $1.1M, came from the cap-park's standing capital reserves built up across a public-private capital campaign that has run continuously since the original park opened. A second $720,000 came from a regional foundation lead gift specifically designated for the splash-pad family-amenity expansion. A third $580,000 came from federal placemaking grants administered through the Department of Transportation's Reconnecting Communities initiative — a relatively new federal program funding cap-park-style infrastructure investments that knit divided neighborhoods together. The remaining $400,000 came from corporate sponsorships from three regional companies headquartered downtown, structured as feature-naming acknowledgments rather than commercial branding inside the pad area. The funding mix preserved the cap-park's free-public-amenity character while distributing capital risk across the same multi-stakeholder structure that had characterized the broader project from inception.
Design choices on a constrained deck site
The pad's design firm worked from constraints that no conventional pad site presented. Total available area was limited by the deck's structural geometry and by adjacent park programming requirements. Mechanical-equipment placement was constrained by the dedicated below-deck vault location. Drainage capacity dictated the maximum simultaneous flow rate from active features, in turn limiting feature density. The 4,200-square-foot pad accommodated 28 features within these constraints, with the feature mix oriented around moderate-flow ground sprays, low-profile bubbler features, and three signature low-water-volume kinetic installations. The signature installations were specifically chosen for their visual impact at low flow rates, allowing the pad to deliver a marquee experience within the deck's hydraulic constraints. Shaded perimeter seating accommodates 180 caregivers at peak. The pad's surface materials were specified for thermal performance on a deck site with limited subsurface mass — Texas summer surface temperatures on conventional pad surfaces can become unsafe by midday, but the cap-park pad uses a custom thermally-rated surface that maintains safe temperatures throughout peak summer hours.
Operating model and the cap-park institutional context
Operating model integration with the broader cap-park's public-private operating structure was straightforward — the splash pad falls under the cap-park's existing nonprofit-conservancy operating framework rather than under conventional city-parks-department operations. The conservancy operates the pad with seasonal staffing supplemented by parks-department water-quality testing under a long-standing memorandum of understanding. Operating costs run materially higher than conventional municipal-pad benchmarks — roughly $185K annually — reflecting the deck's specialized maintenance requirements, the conservancy's full-service operations model, and the pad's marquee-asset positioning that supports more intensive visitor-experience investment. Operating revenue from the broader cap-park's food-and-beverage concessions, programming partnerships, and corporate-event hosting offsets pad-specific costs, allowing the conservancy to operate the pad as a free public amenity within a sustainable financial model. The institutional split between conservancy operations and city water-quality oversight has functioned well across the first season.
Visitor outcomes and cap-park identity
First-season pad attendance reached approximately 215,000 visits across a 175-day operating season — extended by Dallas's long warm season and the deck's controlled microclimate. Independent visitor-origin sampling commissioned by the conservancy indicated strong utilization across both downtown residents and regional families, with roughly 22% of visitors traveling from outside the local metropolitan area. The pad has materially shifted the cap-park's visitor demographics toward family households with young children, broadening the user base that earlier conservancy programming had targeted. The cap-park's annual visitor count rose roughly 18% year-over-year following the pad's opening. Visitor-experience surveys indicated strong satisfaction with the pad as a marquee asset, and the pad has become the cap-park's most-photographed feature. Regional and national placemaking publications have cited the pad as a reference for cap-park family-amenity integration, and several other cap-park projects in early planning across the country have studied the Dallas composite as their primary precedent.
Replicability across other cap-park projects
The Dallas cap-park splash-pad model is replicable across other cap-park projects, of which roughly twenty are in various planning stages nationally as of the mid-2020s. The conditions for success are specific. First, the underlying deck must have structural capacity to accommodate the pad's loading, ideally specified during original deck design rather than retrofit. Second, mechanical-room placement requires below-deck vault access and waterproofing detailing that conventional pad projects do not require. Third, the operating-model integration must align with the cap-park's existing institutional structure — a conservancy-led operating framework absorbs marquee-asset operating costs more readily than a conventional city-parks-department budget. Fourth, the funding stack must reflect the cap-park's public-private character, drawing from federal placemaking and reconnecting-communities programs that increasingly support cap-park infrastructure. Fifth, the pad's design must respect the deck's hydraulic and thermal constraints. Where these conditions converge, the cap-park splash-pad pattern produces unusually strong outcomes for an urban infill amenity, and the federal Reconnecting Communities initiative is making increased federal funding available for analogous projects nationally.
Voices from the project
“We took a sunken freeway and put a park on top of it. The splash pad turned the park into a place that families across the region drive in to visit on Saturday mornings.”
“Eight lanes of active freeway run beneath this pad. Every detail — load capacity, drainage, waterproofing, thermal performance — had to be solved twice over compared to a conventional site.”
“The cap-park stitched the city back together. The splash pad gave the cap-park a heartbeat. You cannot have one without the other.”
Lessons learned
- Specify splash-pad loading during original cap-park deck design — retrofit verification is feasible but adds cost and risk.
- Place mechanical equipment in a below-deck vault with waterproofed deck penetrations engineered for repeated thermal and load cycling.
- Design pad hydraulics within deck drainage constraints — active feature density may be lower than conventional sites permit.
- Specify thermally-rated surface materials for limited subsurface mass — deck-site surface temperatures behave differently than ground-level pad surfaces.
- Tap federal Reconnecting Communities and similar placemaking-and-transportation programs as funding sources for cap-park amenities.
- Integrate operating model with the cap-park's existing conservancy structure rather than transferring to standard parks-department operations.
- Track visitor-origin and demographic shifts to demonstrate the pad's contribution to broader cap-park placemaking outcomes.
FAQ
Can a splash pad really be built on a deck spanning active freeway?
Yes, with engineering rigor. The deck must have verified structural capacity for water-feature loading, mechanical equipment must sit in a below-deck waterproofed vault, drainage must integrate with deck stormwater systems, and surface materials must perform on a deck-thermal profile. The Dallas composite demonstrates the integrated solution.
How do operating costs compare to conventional municipal pads?
Materially higher — typically two to three times conventional benchmarks — reflecting specialized deck maintenance, conservancy operating models, and marquee-asset visitor-experience investment. Operating revenue from broader cap-park concessions and programming offsets the premium.
What is the federal Reconnecting Communities program?
A Department of Transportation initiative funding capital projects that mitigate or remove transportation infrastructure dividing communities, including cap-parks, freeway removals, and related placemaking investments. The program has materially expanded federal funding for cap-park projects since 2022.
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