Horseshoe Kelp

Horseshoe Kelp is a submerged reef and kelp ground in the outer harbor approaches of San Pedro Bay, sheltered behind the 8.3-mile Federal Breakwater that fronts the Port of Los Angeles and the Port of Long Beach. The complex runs in a rough horseshoe about ten miles long, from Point Fermin on the San Pedro side east and southeast toward the dropoff north of Huntington Flats, with the Angels Gate and Queens Gate harbor entrances marking the north edge. Depths range from about 40 feet on the shallowest reef pieces to 100 feet along the outer edges, over a mix of rocky reef, coarse sand, and the low pillars locally called boiler rocks. Remnant kelp still grows over the hard structure. Named sub-pieces include the Rockpile, Middle Grounds, East End, and Jackpot Rock. Historically the site carried a kelp bed thick enough to give the ground its name, but the canopy today is patchy and reduced from that scale rather than absent. For decades it has been the standard year-round half-day fishing ground worked out of every major LA and Long Beach landing.

The hard structure and boiler rocks make this a rocky reef biome. The remnant kelp that still anchors on the reef, thinner than the historical bed but present across much of the ground, keeps a kelp forest biome in play. Seasonal migratory fish such as yellowtail, bonito, and barracuda move through the outer-harbor water column here, making the ground a pelagic biome as well.

Access is by boat only. Departures run out of the San Pedro landings at 22nd Street Landing and LA Harbor Sportfishing, with Long Beach Sportfishing and Pierpoint Landing on the Long Beach side and Marina del Rey a longer option to the west. The lee of the breakwater keeps currents mild and dampens most swell, though a large south or southwest swell can wrap around and reach the east end near Queens Gate. Visibility is highly variable. Runoff from the LA River, the Dominguez Channel, and the harbor storm drains drops clarity for days after rain, and constant commercial vessel traffic through the busiest port complex on the US West Coast stirs sediment. The bulk of the productive water sits below 40 feet, so the ground is not snorkel-friendly.

Horseshoe Kelp lies outside all four mainland Los Angeles County marine protected areas, so fishing and spearfishing are legal here under standard California regulations, though the eastern edge sits close enough to the Federal Breakwater that any Port of Los Angeles or Long Beach security-zone restrictions along that boundary should be checked before diving.