Brazos Santiago Pass is a 1.14-mile-long navigable strait connecting the Gulf of Mexico to the Lower Laguna Madre near Port Isabel, Texas. It is a major tidal inlet defined by parallel jetties spaced approximately 0.25 miles apart, with the South Padre Island jetty extending from the island's shoreline. The pass is a primary shipping channel, resulting in significant boat traffic, including commercial vessels, which is a critical safety consideration for paddlers. The tidal currents are strong, with predicted flood currents exceeding 1.6 knots and ebb currents reaching 1.7 knots; planning a trip to paddle with the tide is essential, and consulting a real-time current forecast is mandatory. The area is open and exposed to winds from the southwest through northwest, offering little natural protection and creating potential for choppy conditions. A specific safety incident involved a kayak overturning near the jetties, underscoring the inherent risks. The pass is explicitly noted as dangerous for swimming due to boat traffic and tidal movements, a warning that extends to paddlers. For access, Isla Blanca Park at the southern tip of South Padre Island offers a potential launch point with views across the pass. The waterway serves as a gateway to the expansive, shallow grass flats of the Lower Laguna Madre to the west. Water temperatures are warm, with recent data showing surface temperatures around 80-82°F in late summer.