Accessing Riverdale Regional Park and Fairgrounds

Construction within Riverdale Regional Park may affect the flow of traffic into and out of the park. As of March 2026, Park Boulevard is closed for widening and improvements north of the roundabout on 124th Ave./Henderson Rd., and entry and exit to the park will be through the Adams County Historical Society Museum entrance, just west of Park Boulevard from the roundabout. Visitors can enter the park through the Museum entrance, and should follow all marked detours within the park.

Please note: All vehicular traffic must follow Golf Course Way west/northwest upon entry into the park, and will then stay right on Park Blvd. to continue south towards the facilities and park amenities. All visitors must exit the park following the same path with which they entered. Please see the map below or call 303.637.8000 if you have questions about navigating the park.

Project Overview

Phase one of the Riverdale Regional Park Improvements includes improvements to the Brantner Gulch, site infrastructure and utilities, midway relocation and barns, and an outdoor covered arena.

People enjoying a park beside large parking area and bus terminal

Parking lot with cars, people walking, landscaped area, visible sports field, and a large blue structure.

Tasks and Timelines
Task	Estimated Timeline	Progress Status	Responsibility
Brantner Gulch Stream Restoration and Flood Mitigation	November 2024-Mid-2026	In Progress	Mile High Flood District/Muller/CEI
Infrastructure and Utility Modernization	December 2024-Mid-2026	In Progress	Populous/Mortenson
Midway Redesign	January 2025-June 2025	Complete	DHM/Mortenson
Park Boulevard Closure	March 2026-June 2026	In Progress	Mile High Flood District/Muller/CEI
Barns	April 2025-June 2026	Complete	DHM/Mortenson
Outdoor Covered Arena and Horse Barn	August 2025 – Mid-2026	In Progress	Populous/Mortenson

The site infrastructure, utilities, and midway projects are taking place in unison with the Brantner Gulch improvements and began in December 2024. The midway was completed in July 2025, and two of the new barns were completed in December 2025. The outdoor arena and remaining barn are expected to be completed in mid-2026.

Construction Zone Closures

The Riverdale Regional Park Improvements will create areas of closure within the park as crews work on these improvements. The map below details the areas currently under construction and closed to the public within the Midway area of the park.

Construction Viewing Locations

The Parks, Open Space & Cultural Arts department worked with the construction and design teams to create construction viewing locations, so park visitors can observe the improvement projects and learn more about their benefits. Viewing locations are established for the Brantner Gulch project and the midway and barns improvement project. To view the informational signage at each viewing location, please click here.

Brantner Gulch Improvements

Midway and Barns Improvements

Brantner Gulch Improvements

The Brantner Gulch Project is a collaborative partnership with the Mile High Flood District to design and construct stream restoration and flood control improvements in the Riverdale Regional Park in order to address the Brantner Gulch capacity issues and reduce flood risk. The stormwater flows from this highly developed watershed cause damage to infrastructure and send overflows into nearby storage lakes, which threatens the natural resources, wildlife, and surrounding residents and businesses. This project will construct a new gulch to protect people and property against flooding, enhance the stormwater quality within the stream, and will change the floodplain map effectively taking the fairgrounds out of the floodplain. It will also provide an opportunity to beautify the park further, naturalize the area, and create more spaces for enjoying nature. These improvements will establish a foundation for future progress of the park, create a secondary egress for emergency vehicles, expand Park Boulevard for more efficient traffic flows, and allow the Park and its facilities to be used for emergency sheltering.

It is slated to begin in November 2024 and continue in phases to accommodate operations and events with an anticipated completion in mid-2026.

Aerial view of a scenic park with parking lots, winding roads, grassy areas, and a river.

People relaxed at a pavilion, overlooking a vibrant park landscape.

Site Infrastructure and Utilities

The Riverdale Regional Park is in need of infrastructure improvements to maintain existing facilities and usage and to prepare for future expansion and the increase in visitor usage. The project will entail upgraded electrical, sanitary and storm sewer, domestic, fire, and raw water, and fiber for internet service. It will also include site work, improved drainage, roadways, parking lots, pedestrian paving, landscaping, and lighting.

Midway Relocation and Barns

The new Midway will be large enough for the entire current Fair layout, plus expansion space. It will provide better access, pedestrian safety, and enhanced experiences. It will create a drop-off area in close proximity to events with a circular two-lane drive and direct bus access.

The new barns will create an “Ag land” atmosphere and support the Grand Stands, Outdoor Covered Arena, Fair, and other agricultural and livestock events within the Park.