Constantine Buoy
San Luis Obispo · San Luis Obispo County · California
Did you dive today?Please share the visibility to make our algorithm more accurate.
Report visibility
Today's forecast
Updated 10:00 AM PT today · July 28, 2026The clarity holds through the day, with a light afternoon onshore the only disturbance to the entry shallows.
7-Day Forecast
Map · getting there
35.444° N · 120.932° W
San Luis Obispo County, CA
Open in Google Maps
Open in Apple MapsAbout Constantine Buoy
Constantine Buoy is a green can navigational buoy roughly half a mile offshore north of Cayucos, marking an extensive reef structure with a wide footprint of rocky relief, large boulders, and bull kelp anchored on the rock. Depths run from about 20 feet on the kelp-covered shoals to 60 feet on the deeper rocks. Access is by boat or kayak from Morro Bay Harbor, or by kayak surf-launched from Cayucos State Beach.
Bull and giant kelp anchored on the rocky reef and growing up through the water column to the surface make this a kelp forest biome. The large boulders and the bare-rock structure between the kelp patches form a rocky reef biome. The open water around the reef, used by transiting larger fish and seasonal pelagic species, is a pelagic biome.
Spearfishing drives most traffic here. Forgiving depth, dense kelp, and a long record of large fish have made the buoy a regular destination for Morro Bay and Cayucos spearfishers, and scuba diving and wildlife photography in the kelp are common as well. Currents are moderate, the kelp tames most swell, and the site turns uncomfortable only on a building day.
No MPA covers this site. Hook-and-line fishing and spearfishing are legal under standard California regulations.
Kelp Forest
The kelp forest biome is giant kelp anchored to rocky bottom and growing up through the water column. The canopy and stipes form a three-dimensional habitat that shelters fish, invertebrates, and the predators that hunt them. Learn more about this biome and the species found in it by clicking the link below.
Learn more in the Biome Glossary
Rocky Reef
The rocky reef biome is bare rock, boulder, and cobble structure without a kelp canopy above it. The hard relief and its crevices shelter invertebrates and reef fish, and the structure concentrates life that the surrounding sand cannot hold. Learn more about this biome and the species found in it by clicking the link below.
Learn more in the Biome Glossary
Pelagic
The pelagic biome is open water away from the bottom and from structure. It is the realm of fast, schooling fish and the large predators that follow them in from deeper water. Learn more about this biome and the species found in it by clicking the link below.
Learn more in the Biome GlossaryTarget Fish Species
Nearby beaches
Surf Zone
Ocean Oracle ProGain the Power
of the Oracle.
Ocean Oracle sees the future. Get 7-day visibility forecasts for every beach, plus alerts the night before clarity peaks — so you never miss a prime day.
Free shows you what the ocean looks like today. Ocean Oracle shows you the week ahead and the fish waiting for you down there.
Visibility predictions for the entire week ahead at any beach. Plan dives, schedule charters, book trips — without guessing.
The night before any beach hits prime conditions, Ocean Oracle pings your phone. Wake up knowing exactly where to go.
Track your favorite beaches in one place. Forecasts and alerts for everywhere you dive.
For every beach: what species are there, when they show up, and how to target them. Built by spearos, for spearos.
See the future. Dive on the right days.