The lagoon offers excellent protection to small craft in all weather.
Pūko’o Harbor 7.4 miles SW of Cape Hālawa is a pocket in the reef some 800 yards long and 250 yards wide. The entrance is through a break in the reef from the SE.
A privately dredged channel continues from the harbor to a three-fingered boat lagoon called Pukoo Lagoon. The entrance to the lagoon is a 60-yard opening through a rock seawall. A depth of 12 feet can be carried across the harbor entrance to the lagoon channel. The lagoon channel has a depth of 6 feet with a depth of 4 feet inside.
The outer harbor is smooth during the trades, although the wind sweeps across it with full force. The passage through the reef is marked on either side by breakers. During kona storms, breakers extend across the passage. Boats entering the harbor should start their approach midway between the breakers and steer for the opening in the seawall of the boat lagoon. Caution should be exercised as there are no navigation aids, and numerous coral heads and submerged rocks are on both sides of the channel; local knowledge is advised.