If you drove past the entrance to Kaloko-Honokōhau National Historical Park anytime between late October 2025 and this spring, you probably noticed the petroglyph boardwalk was closed. Crews had pulled up the old wood and were replacing it plank by plank, a repair that took about seven months. The boardwalk reopened in late May 2026, and benches and a shaded structure are still on the way. That's the kind of update that shows up on the park's Facebook page and then disappears from most people's radar within a week.
It shouldn't. The boardwalk exists to protect something fragile enough that the National Park Service decided a raised wooden path was worth building over open lava rock in the first place. And what it's built over says more about this stretch of coast than the boardwalk itself ever will.
What the Boardwalk Actually Protects
The petroglyphs at Kaloko-Honokōhau are carved directly into old lava flows along the shoreline. They sit along the same coastal strip as the ʻAiʻōpio Fish Trap and ʻAimakapā Fishpond, both remnants of a fishing settlement that predates written history on this island. The park protects the coastal portions of five different ahupuaʻa, the traditional Hawaiian land divisions that ran from mountain to sea, and it was established as a national historical park back in 1978 specifically to preserve that record.
A boardwalk raised above the rock does two things at once. It keeps foot traffic from wearing down carvings that took generations to make, and it keeps visitors from wandering off the marked path into terrain that includes something most people walk right past without noticing: anchialine pools.
The Pools You're Actually Walking Past
Anchialine pools look like tide pools, but they aren't fed by the ocean splashing over rocks. They're landlocked, connected to the sea only through underground lava tubes and cracks, and filled by a mix of fresh groundwater and saltwater that rises and falls with the tide even though there's no visible channel to the shore. Kaloko-Honokōhau alone holds more than 200 of them. The entire Kona Coast, which has the largest concentration of these pools anywhere in the state, has just over 400. That means this one park accounts for roughly half of everything Hawaii has.
Living in those pools is a shrimp about half an inch long called ʻōpae ʻula. It's easy to dismiss something that small, until you learn it can live for 10 to 15 years, an unusually long lifespan for a crustacean its size, and that Hawaiians historically used it as bait to catch ʻōpelu during spawning season. Some pools were reserved for royalty to bathe in. Others served as drinking and irrigation water in a coastline with almost no natural freshwater access. Fishermen used them to keep their catch cool on hot days, long before anyone had a cooler.
In 2025, ʻōpae ʻula was named Hawaii's official state shrimp, a designation meant to draw attention to a habitat most visitors never notice they're standing next to.
What the Recognition Is Actually For
Naming a shrimp the state shrimp isn't a ceremonial gesture with no substance behind it. Researchers studying the anchialine pools at Kaloko-Honokōhau have found that ʻōpae ʻula function as bioindicators, meaning their health reflects the health of the groundwater flowing beneath the coast. When the shrimp are present and healthy without invasive fish competing with them, they graze down algae and keep the pools clear. When something changes upstream, the shrimp are often the first sign.
That matters here specifically because the pool cluster researchers studied sits less than a mile from the Kealakehe Wastewater Treatment Plant, where minimally treated R2 wastewater is currently discharged into a lava field. A planned upgrade to that facility has been delayed by several months. Sea level rise is complicating the picture from the other direction too, pushing more groundwater into contact with that sewage infrastructure even as it creates new pools elsewhere along the coast. As Hawaiian scholar Hannah Springer put it in an essay for the Conservation Council for Hawaiʻi, describing what happened to many of these pools as tourism development reached the coast decades ago, "Repurposing has been aggressive."
None of this means the pools at Kaloko-Honokōhau are in crisis today. It means the small red shrimp under that reopened boardwalk is doing quiet, ongoing work that scientists are actively watching, and that the story of this park isn't finished just because the walkway is fixed.
Rounding Out the Morning
If you're making the trip down from Kaloko anyway, the park pairs naturally with two stops that don't get nearly as much attention as the beach.
The Natural Energy Laboratory of Hawaii Authority, known locally as NELHA, sits just south of Kona International Airport, a short drive from the park's own entrance off the same highway. The nonprofit Friends of NELHA runs public tours of the 870-acre HOST Park, and the schedule actually changes by day of the week:
- Monday: tech and innovation, covering the deep seawater pumping system that draws water from up to 2,200 feet down
- Tuesday and Thursday: ocean conservation, including a stop at Ke Kai Ola, the Hawaiian monk seal rehabilitation center
- Wednesday and Friday: sustainable aquaculture, with visits to tenants like the Big Island Abalone Corporation and Kanaloa Octopus Farm, the world's first commercial octopus farm
Tours run about 2.5 hours and require reservations, so this isn't a spontaneous drop-in the way the park is.
Then there's lunch at Honokōhau Harbor itself. Harbor House has been serving locally caught fish and cold drafts from an open-air dining room on the marina for about 25 years, with happy hour running daily starting at 3pm. It's also part of a bigger story unfolding in Kona restaurants right now. Harbor House, along with Jackie Rey's and Umekes Fish Market Bar & Grill, formed the Island Restaurant Group, which purchased the century-old Kona Inn Restaurant and Kona Canoe Club on Aliʻi Drive in 2026 and relaunched them with a revamped menu and dining space in June. It's the same ownership group keeping the harbor's own restaurant running, and it says something about the current appetite among Kona's independent operators to reinvest in the places they already have rather than chase something new.
The Point of Walking It
The boardwalk being open again is a small, practical fact. It means you can get to the petroglyphs without detouring around construction fencing. But the reason that boardwalk exists at all, and the reason a half-inch shrimp now carries an official state title, is the same reason worth carrying with you on the walk. This stretch of coast below Kaloko isn't a fixed backdrop that happens to look good in photos. It's an active, monitored ecosystem where a repair project, a state designation, and a wastewater upgrade delay are all part of the same ongoing story, playing out right now, a few minutes from home.
If you've lived in Kaloko a while, you've probably driven past this park more times than you've stopped in it. With the boardwalk open again, this is a good season to change that.
For questions about homes and neighborhoods throughout Kaloko and the rest of West Hawaiʻi, Team Kuessner Davis is always happy to talk story. Schedule a consultation whenever the time feels right.
