What it is
The Wai Koa Loop Trail is an easy, mostly flat hiking and biking path on private agricultural land in Kīlauea on Kauai's North Shore. The trail is notable for passing through the largest mahogany plantation in the United States, creating a scenic "tree tunnel" effect. The main destination along the route is the historic Kīlauea Stone Dam, built in the 1880s to irrigate a former sugar plantation. The trail is a public access route protected by a conservation easement held by the Hawaii Land Trust. Although historically a 5-mile loop, due to storm damage and access changes, the trail is now primarily used as a 3.5 to 4.5-mile out-and-back route to the dam.
Visitor experience
Visitors walk or bike along wide, unpaved farm roads. The experience combines shaded sections through the regimented rows of mahogany trees with open, sunny pastures offering views of the Namahana mountains. The destination is the Kīlauea Stone Dam, a picturesque spot with cascading water where visitors often stop for photos and picnics. A swimming hole with a rope swing is located just above the dam. The trail is considered family-friendly and suitable for all skill levels, including walkers, joggers, and cyclists. Leashed dogs are permitted. Near the dam, a short path leads to a bamboo grove and a Buddha statue.
Logistics
- Location: Kīlauea, on Kauai's North Shore.
- Access & Parking: Public access is primarily through the North Shore Dog Park on Kahiliholo Road. The original trailhead at the Anaina Hou Community Park is reported by some sources as closed for trail access. Parking at the dog park is free.
- Waiver: A liability waiver is required as the trail is on private land. The official Anaina Hou Community Park website states a waiver must be completed and provides an online form. Other recent reports mention a QR code at the trailhead for a digital waiver. Some hiker reports from 2023 and early 2024 suggest waivers are no longer needed at the dog park entrance; this should be verified.
- Hours: The trail is generally open daily from dawn to dusk. Anaina Hou Community Park lists trailhead hours from 9:00 am to 7:00 pm.
- Cost: Access is free.
- Duration: The out-and-back hike to the stone dam is typically 3.5 to 4.5 miles and takes 1.5 to 2.5 hours, depending on pace and time spent at the dam.
- Facilities: There are no restrooms or potable water available at the dog park trailhead or along the trail. Restrooms and other amenities are available at the main Anaina Hou Community Park complex.
Safety and cautions
- Trail Conditions: The trail consists of unpaved farm roads and can become very muddy and slippery, especially after rain. Sturdy shoes that can get dirty are recommended.
- Private Property: Visitors must stay on the marked trail. The trail crosses a working plantation.
- Swimming: Swimming at the stone dam is at your own risk. There is no lifeguard, and rocks can be slippery.
- Pests: Mosquitoes are common, particularly in the forested and damp areas. Bug spray is highly recommended.
- Weather: The trail has both shaded and fully exposed sections. Sun protection is necessary. Rain showers can occur suddenly.
Editorial take
This trail is an excellent choice for families, multi-generational groups, casual walkers, trail runners, and mountain bikers seeking a low-impact and scenic outing away from the coast. The combination of the unique mahogany forest, pastoral views, and the historic dam with a swimming hole makes it a rewarding experience for those not seeking a strenuous or technical hike.
Serious hikers looking for dramatic ridge-lines, significant elevation gain, or expansive coastal vistas should skip this in favor of trails like the Kalalau Trail or Waimea Canyon trails. While beautiful, the scenery is primarily agricultural and forested inland views. The key confusion for visitors is the access point and waiver requirement; the most reliable current information points to starting at the North Shore Dog Park, and visitors should be prepared to sign a waiver via a QR code at the entrance.
Source notes
- Anaina Hou Community Park - Wai Koa Loop: Official information from the managing non-profit, including an online waiver form and listed hours.
- Common Ground Kauai - Stone Dam: Information from an organization on the plantation, clarifying public access routes and hours.
- Hawaii Magazine - "This Hike on Kauaʻi is a Walk Through an Enchanted Forest" (Nov 2024): A recent article confirming the trail is open, its out-and-back nature, and access via the North Shore Dog Park.
- Kauai Travel Blog - Wai Koa Loop Trail: A detailed visitor guide from early 2023 noting the access shift from the community park to the dog park and the out-and-back configuration.
- onX Backcountry - Stone Dam via Wai Koa Trail: A trail guide confirming access is via the dog park and that the route is now primarily out-and-back.
- Hawaii Activities - Wai Koa Loop Trail: A general travel guide providing a good overview of the trail's features and highlights.
