Richardson Beach Hazards

Richardson Ocean Park sits at the eastern end of Hilo Bay on the Big Island’s windward coast. Unlike most Hawaiian beaches, Richardson is primarily a lava rock coastline with small pockets of black sand. The entry points are through gaps in the lava shelf where natural pools form, creating small protected areas for wading and snorkeling.

The beach is one of the most reliable places on the Big Island to encounter green sea turtles (honu), which feed on the limu (seaweed) growing on the lava rock. Turtles rest in the shallow pools and along the entry areas, sometimes blocking the only accessible path into the water. Federal law requires maintaining a 10-foot distance.

Hilo receives more rainfall than nearly any coastal city in the United States — roughly 130 inches per year. This means the water quality at Richardson is frequently affected by runoff. The Wailoa River, which drains a large agricultural and residential watershed, enters Hilo Bay less than a mile west of the park. After any significant rain, turbidity increases and bacteria levels rise.

Winter (November – March)

East and northeast swells push directly into Richardson, creating surge across the lava shelf and making entry and exit hazardous. Waves wash over rocks that are normally above waterline, and the channels between lava formations become turbulent. Winter is also Hilo’s wettest season, so bacteria-laden runoff is a near-constant concern. Water temperatures drop to 75–76°F. Snorkeling visibility can be reduced to under 5 feet after storms.

Summer (April – October)

Conditions improve significantly as east swell subsides. The protected coves become calm enough for beginning snorkelers, and turtle sightings are frequent. Water temperatures reach 79–80°F. However, Hilo still receives rain in summer (roughly 8–10 inches per month), so water quality advisories remain possible year-round. Check DOH postings at the park entrance before entering.

Anyone without reef shoes: Lava rock entry is non-negotiable here. The pahoehoe surface is sharp, uneven, and covered in slippery algae. Reef shoes or sturdy water sandals are essential. Bare feet will result in cuts, and those cuts heal slowly in tropical humidity.

Snorkelers drifting east: The protected pools near the park give way to exposed coastline beyond the eastern headland. Once past the lava point, currents strengthen and there are no easy exit points. Keep the shoreline in sight and turn back well before reaching the point.

Visitors after rain: Hilo averages rain more days than not. If it rained in the past 72 hours — even lightly — bacteria levels may be elevated. Look for brown or murky water near the river mouth as a visual indicator. There are no lifeguards at Richardson, so you must make your own assessment.

What are the biggest dangers at Richardson Beach?

Rocky entry over lava rock. Strong currents on east side. Sea urchins in tide pools. Bacteria after heavy rain from Wailoa River.

Does Richardson Beach have lifeguards?

No. Nearest hospital: Hilo Medical Center (3 mi). Cell phone coverage: Good.

What are conditions like at Richardson Beach in winter vs summer?

Winter: Large east swells create surge and dangerous entry/exit conditions. Summer: Calmer conditions, good for snorkeling, sea turtles frequent the area

Who should be cautious at Richardson Beach?

Reef shoes are essential. The lava rock entry is sharp and slippery. Stay away from the east point where currents are strong.