The bridge you're likely referring to is the Overseas Highway, particularly the Seven Mile Bridge, which is an iconic structure connecting the Florida Keys to the mainland. Here's an evocative depiction of the bridge against the azure waters:

**1. Turquoise Waters Stretching Below:**
   - As you approach the Seven Mile Bridge, the waters beneath transform into a mesmerizing shade of turquoise. The clarity of the water allows you to see the ocean floor, revealing a tapestry of seagrass and marine life.

**2. Architectural Marvel Spanning the Horizon:**
   - The Seven Mile Bridge, an engineering marvel, stretches gracefully across the expansive horizon. Its arching structure complements the natural beauty of the surrounding azure waters.

**3. Azure Gradations:**
   - The water's color transitions from a deeper blue near the bridge's supports to a luminous azure in shallower areas. Sunlight dances on the surface, creating a play of reflections and ripples.

**4. Sunlight Piercing Through:**
   - Sunlight pierces through the clear water, creating pockets of brilliance that highlight the bridge's supports. The sunlight refracts in the water, casting a dazzling display of patterns on the ocean floor.

**5. Contrasting Green Mangroves:**
   - Along the edges of the water, vibrant green mangroves provide a striking contrast to the azure surroundings. Their roots dip into the shallow waters, adding to the coastal allure.

**6. Gentle Breeze and Salty Air:**
   - A gentle breeze carries the scent of the salty sea air. The atmosphere is both invigorating and tranquil as you traverse the bridge, with the wind playing through your hair.

**7. Views of the Open Sea:**
   - As you progress along the bridge, the azure waters extend to the open sea. The vastness of the ocean becomes apparent, and the bridge seems to lead you to a world where sky and water seamlessly meet.

**8. Reflections on the Water's Surface:**
   - The bridge's reflection shimmers on the water's surface, creating a mirror-like effect. The reflections add an extra layer of visual poetry to the already picturesque scene.

**9. Occasional Pelicans in Flight:**
   - Occasionally, pelicans glide effortlessly above the water, their wings casting shadows on the surface. These graceful birds become part of the living canvas, symbolizing the untamed beauty of the Florida Keys.

**10. Endless Horizon and Island Chains:**
   - The bridge seems to stretch towards an endless horizon, connecting the scattered island chains of the Florida Keys. Each island is a unique gem in the archipelago, contributing to the allure of the journey.

**11. Sunset Magic:**
   - If you're fortunate enough to traverse the bridge during sunset, the azure waters transform into a palette of warm hues. Oranges, pinks, and purples paint the sky, casting a magical glow over the bridge and the sea below.

The bridge to Key West, set against azure waters, is not just a transportation link; it's a visual symphony that encapsulates the beauty and allure of the Florida Keys. The journey becomes a sensory experience, with each moment revealing the natural wonders of this coastal paradise.