Coastal Passages: US East Coast, Gulf, and Pacific

Cruising Guide · US Coastal Routes

American coastal sailing has a geography all its own. The Eastern Seaboard's combination of the Intracoastal Waterway, the Gulf Stream, and the dramatic corner at Cape Hatteras creates a passage-planning environment unlike anywhere else in the world. The Pacific Coast presents entirely different challenges: persistent northwest swell, upwelling-driven cold water, coastal fog, and a few notorious headlands where conditions can deteriorate in hours. Understanding these routes — their seasonal rhythms, their specific hazards, and their proper timing — is what separates a sailor who completes them from one who gets caught out.

The ICW: Norfolk to Miami via the Intracoastal

The Atlantic Intracoastal Waterway runs from Norfolk, Virginia (Mile 0) to Miami, Florida, a distance of approximately 1,100 nautical miles through a protected network of rivers, sounds, bays, estuaries, and canals. For boats heading south for the winter, the ICW is the primary route — it avoids the offshore passage past Cape Hatteras, Cape Fear, and the shallow-water shoaling zones off the Carolinas that have claimed vessels for centuries.

The depth restriction is real: the ICW is maintained to a nominal 12 feet in the main channel, but shoaling is endemic throughout the system, and a boat drawing more than 6 feet will spend significant time in the shallows if it strays from the marked channel. The Carolinas ICW — particularly the sections through North Carolina's Sounds and the South Carolina Low Country — are the most challenging for draft. Current charts and recent cruising reports (the Waterway Guide is the standard reference) should be consulted before the Carolina sections.

Bridge schedules are the other ICW reality. Fixed bridges on the ICW have minimum vertical clearances (typically 65 feet on the main ICW, though the limiting bridges are lower in some sections), and opening bridges operate on schedules that vary by bridge and by season. A boat with a 50-foot mast cannot use the ICW — the bridge clearances will stop it. Most cruising sailboats with 55–60 foot clearance requirements skip the ICW and sail offshore. Smaller rigs and powerboats are the primary ICW users.

The fall ICW migration runs October through November, when a southbound fleet of snowbirds makes the transit. The traffic in popular anchorages — Elizabeth City, Beaufort NC, Wrightsville Beach, Georgetown, Beaufort SC, and the Georgia ICW anchorages — peaks in October and early November. Arriving before mid-October or after Thanksgiving finds the system noticeably quieter. Northbound migration happens in the spring, March through April, with comparable congestion at the same stops.

The Bahamas Crossing: Gulf Stream and the Window

Crossing the Gulf Stream from the US East Coast to the Bahamas is a 50 to 75 mile passage — from Fort Lauderdale or Stuart to Bimini or West End, Grand Bahama. It is short enough that it can be completed in a single day, and it is dangerous enough that it has sunk dozens of boats. The danger is specific: the Gulf Stream.

The Gulf Stream runs northeast through the Florida Straits at 2–4 knots. When a cold front passes, it generates northerly winds — and northerly winds against the northeast-flowing Gulf Stream create short, steep, confused seas that are disproportionately severe for the wind speed. A 20-knot northerly with the Gulf Stream running against it produces seas that behave like 35-knot conditions. Boats that cross in the window between a front passage and the next northerly behind it make easy passages; boats that cross with any northerly component in the wind have reports involving breaking seas, knockdowns, and very anxious crews.

The crossing window is a calm day with a light southerly or southeasterly, or no wind at all, before the next front arrives. In winter (December–February), the windows are short — sometimes 2 to 3 days between frontal passages. Planning for a Bahamas crossing in winter means watching the weather for a 5-day pattern: front passes, 1–2 days of settling, then an ideal crossing day, then the next front approaches. In spring (March–May), the windows are longer and the conditions generally lighter. Most experienced Florida sailors treat the Gulf Stream crossing as the first offshore passage of a Bahamas trip, requiring the same weather attention as a 500-mile offshore run.

Cape Hatteras: The Graveyard and the Inside vs. Outside Debate

Cape Hatteras is the most notorious stretch of sailing water on the US East Coast, and arguably in North America. The cape juts 30 miles into the Atlantic at the point where the Gulf Stream runs closest to the US coast, where the shallow Diamond Shoals extend 14 miles offshore, and where the interaction of the warm Gulf Stream and the cold Labrador Current creates sea conditions that have earned the area its historical name: the Graveyard of the Atlantic.

The practical decision for boats transiting the East Coast is the inside versus outside debate. Inside means the ICW through the Pamlico Sound — a shallow but protected route that bypasses the cape entirely. Outside means an offshore passage that rounds the cape itself, typically staying at least 20 miles offshore to clear Diamond Shoals and positioning the boat in the Gulf Stream for a favorable current push.

The outside passage past Hatteras, when done in good conditions, is 150–200 miles of efficient offshore sailing with the Gulf Stream adding 2 knots to the boat's speed. When done in poor conditions — any northerly or northwesterly wind, any front passing — it is severe. The sea state at the stream edge in a norther is the same dangerous short-steep pattern that threatens the Bahamas crossing. Experienced East Coast sailors choose the outside passage carefully and often: it saves days compared to the ICW. They also know when to go inside, motor through Ocracoke Inlet, and wait out the front in the protected Pamlico.

Pacific Coast: Oregon, California, and Baja

The Pacific Coast passage from the Pacific Northwest to Southern California is a different challenge entirely. The dominant summer wind pattern on the Pacific Coast is a persistent northwest wind and swell driven by the North Pacific High. From June through September, the coast from Washington to Point Conception, California, is often socked in with fog, running a 10–15 foot northwest swell, and blowing 20–25 knots. Going north in this is difficult; going south is straightforward.

Cape Mendocino, at the northern end of California's "Lost Coast," is the East Coast equivalent of Cape Hatteras for Pacific sailors. The cape juts west, the northwest swells wrap around it, and conditions here are frequently rougher than anywhere else on the California coast. Timing a Cape Mendocino rounding for light conditions — typically an overnight passage in the window before the afternoon breeze builds — is standard practice. The standard strategy is to anchor in one of the small bays south of Eureka, wait for a benign weather window, and run the cape overnight.

South of Point Conception, Southern California's sailing is genuinely pleasant — the "California Riviera" weather pattern. The Channel Islands provide protected anchorages and day-sailing destinations. From San Diego, boats heading to Mexico's Pacific coast (the Baja Ha-Ha rally runs from San Diego to Cabo San Lucas each October) need to prepare for a different passage environment: longer distances between ports, limited weather routing infrastructure, and a provisioning stop in Ensenada for Mexican coastal cruising paperwork.

The Great Loop: Eastern North America's Complete Circuit

The Great Loop is the 6,000-mile circumnavigation of eastern North America — down the East Coast via the ICW, across the Gulf of Mexico, up the Mississippi and Tennessee-Tombigbee river system, through the Great Lakes, down the Hudson River, and back down the coast. It is a powerboat route that some sailboats complete, though the air draft restrictions (the Illinois Waterway bridges require 17-foot maximum air draft) mean that any sailboat doing the Great Loop must step the mast for the river sections.

A typical Great Loop takes six months at a pace that allows meaningful exploration — a week in the Florida Keys, a week in New Orleans, the Tennessee River, the Kentucky Lake system, and the Great Lakes in summer. Loopers (the community term for Great Loop participants) have a strong social network: the America's Great Loop Cruisers Association organizes rendezvous at stops along the route, the AGLCA gold burgee is a recognized signal, and the community aspect of the Loop is a significant part of why people do it.

Draft requirements for the Loop are relatively forgiving — the rivers require less than 9 feet in most sections, and the ICW route is the 6-foot limiting factor discussed above. The air draft restriction (17 feet for the Illinois Waterway bridges) is the real constraint. The boat of the Loop is the trawler, the cruiser, or the motor yacht — sailboats that do the Loop are rare and require significant planning around the mast-stepping logistics.

Timing: Maine to Florida and the Chesapeake as Staging Ground

The annual southbound migration of East Coast sailboats runs October through November. The fleet logic is simple: leave New England before the first hard freeze makes the marinas untenable, arrive in Florida before Thanksgiving, and get the boat staged for the Bahamas or Caribbean season by December.

The Chesapeake Bay is the natural staging ground for this migration. Boats leaving New England in late September or October often spend two to three weeks in the Chesapeake — provisioning in Annapolis, working through the final boat jobs before an offshore passage, waiting for the right weather window for the Cape Hatteras run. The Chesapeake anchorages in October are some of the most pleasant on the East Coast: the summer heat is gone, the crab pot density has decreased, and the anchorages at St. Michaels, Oxford, and the Patuxent River have elbow room that is impossible in July.

Departure from the Chesapeake for Cape Hatteras and points south requires watching the same frontal timing discussed above. The offshore run from Norfolk to Beaufort, NC (inside or outside Hatteras) is the first decision; from Beaufort, the inside route south through the ICW or a series of offshore hops to Brunswick, GA and then Jacksonville offers options based on conditions and draft.

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Frequently Asked Questions

What are the draft and bridge clearance restrictions on the Atlantic Intracoastal Waterway? The ICW is maintained to a nominal 12 feet in the main channel, but shoaling is endemic throughout the system and a boat drawing more than 6 feet will spend significant time in the shallows if it strays from the marked channel — the Carolinas ICW sections are the most challenging for draft. Fixed bridges on the ICW have minimum vertical clearances typically 65 feet on the main route, and a boat with a 50-foot mast cannot use the ICW because bridge clearances will stop it. The Waterway Guide is the standard reference for current charts and recent cruising reports on the Carolina sections where shoaling most frequently differs from published depths.

Why is the Bahamas Gulf Stream crossing dangerous despite covering only 50–75 miles? The Gulf Stream runs northeast through the Florida Straits at 2–4 knots, and when a cold front generates northerly winds blowing against the northeast-flowing current, it creates short, steep, confused seas disproportionately severe for the wind speed — a 20-knot northerly with the Gulf Stream running against it produces seas that behave like 35-knot conditions. The crossing window is a calm day with a light southerly or southeasterly before the next front arrives, and in winter (December–February) these windows are sometimes only 2–3 days between frontal passages. Most experienced Florida sailors treat the Gulf Stream crossing as requiring the same weather attention as a 500-mile offshore run.

What makes Cape Hatteras the most notorious stretch of sailing water on the US East Coast? The cape juts 30 miles into the Atlantic at the point where the Gulf Stream runs closest to the US coast, where Diamond Shoals extend 14 miles offshore, and where the interaction of the warm Gulf Stream and the cold Labrador Current creates dangerous conditions that earned the area its historical name, the Graveyard of the Atlantic. The inside versus outside decision — ICW through the Pamlico Sound bypassing the cape, or an offshore passage that rounds the cape itself staying at least 20 miles offshore to clear Diamond Shoals — is the primary routing decision for boats transiting the East Coast. The outside passage in good conditions is efficient with the Gulf Stream adding 2 knots to boat speed; in poor conditions with any northerly wind, the short-steep sea state at the stream edge is genuinely severe.

What seasonal timing works best for the southbound migration on the US East Coast? The annual southbound migration runs October through November — leaving New England before the first hard freeze makes marinas untenable, arriving in Florida before Thanksgiving, and staging the boat for the Bahamas or Caribbean season by December. The Chesapeake Bay is the natural staging ground, with boats from New England typically spending two to three weeks there provisioning in Annapolis, completing final boat work, and waiting for the right weather window for the Cape Hatteras run. The Chesapeake anchorages in October are some of the most pleasant on the East Coast — the summer heat gone, crab pot density decreased, and anchorages at St. Michaels, Oxford, and the Patuxent River with elbow room impossible in July.

What is the Great Loop and what is the main constraint for sailboats attempting it? The Great Loop is the 6,000-mile circumnavigation of eastern North America — down the East Coast via the ICW, across the Gulf of Mexico, up the Mississippi and Tennessee-Tombigbee river system, through the Great Lakes, down the Hudson River, and back down the coast — typically taking six months. The primary constraint for sailboats is the 17-foot maximum air draft required for the Illinois Waterway bridges, meaning any sailboat doing the Great Loop must step the mast for the river sections. The draft requirements are relatively forgiving at less than 9 feet for most river sections, but the air draft restriction makes the Great Loop primarily a powerboat, trawler, and motor yacht route.