Union Iron Works

Union Iron Works Visiting Hours, Tickets, and San Francisco Historical Sites Guide

Date: 14/06/2025

Introduction to Union Iron Works

Union Iron Works is a landmark of San Francisco’s industrial and maritime heritage, offering an immersive journey into the city’s transformative past. Founded in 1849 by Peter Donahue and his brothers as Union Brass & Iron Works, the company played a foundational role in the Gold Rush economy by producing essential mining and transportation machinery. By the 1880s, after relocating to Potrero Point, Union Iron Works became the first steel shipyard on the West Coast, constructing iconic naval vessels such as the USS Olympia and USS Oregon. These ships notably contributed to the United States’ naval power, especially during the Spanish-American War (Pier 70 History; Dreadnought Project; Bethlehem Shipyard Museum).

Today, the historic shipyard is preserved within the Pier 70 Historic District—a vibrant hub of historical preservation, adaptive reuse, and cultural activity. Visitors can explore its architectural marvels and experience San Francisco’s industrial evolution through guided tours, special events, and public exhibitions. This guide provides detailed information on visiting hours, ticketing, site access, and essential travel tips to help you make the most of your visit (Pier 70 Official Website; FoundSF).

Aerial view of Bethlehem Union Iron Works shipyard in 1945 with ships and industrial facilities

Aerial view of Bethlehem Union Iron Works shipyard in 1945 with ships under construction and industrial facilities

Aerial view of Bethlehem Union Iron Works shipyard with multiple large ships and cranes in San Francisco 1945

Aerial view of Bethlehem Union Iron Works shipyard in 1943 showing ships under construction and industrial buildings

Aerial view of Bethlehem Union Iron Works shipyard in 1943 with multiple ships under construction and repair

Aerial view of Bethlehem Union Iron Works shipyard in 1943 with ships and industrial structures

Aerial view of Bethlehem Alameda shipyard in 1944 with ships and industrial buildings

Aerial view of Bethlehem Alameda shipyard in 1944 showing berths and industrial buildings

1899 advertisement for Union Iron Works featuring the Russian armored cruiser Rossia

Aerial view of the Union Iron Works shipyard in San Francisco, California during World War I showing four-piper destroyers, submarines, and merchant ships under construction and docked at various facilities including foundries, machine shops, wharves, and floating docks labeled with detailed plant features

Shipbuilding with steel at Union Iron Works

USS F-2 submarine docked in water in 1912

USS Ingraham (DD-111) destroyer under construction in dry dock at Union Iron Works Hunters Point Yard, San Francisco, 1918

U.S. Navy destroyers USS Kidder DD-319, USS Selfridge DD-320, USS Chase DD-323, USS Mervine DD-322, USS Marcus DD-321, USS La Vallette DD-315, and USS Yarborough DD-314 fitting out at Union Iron Works San Francisco on April 1, 1920

USS Pike (SS-6) submarine launching in San Francisco on January 14, 1903

Launching of USS Pike submarine in San Francisco on January 14, 1903

USS Pike submarine afloat at Union Iron Works in San Francisco after launching in 1903 with Navy pulling boats nearby

Union Iron Works shipbuilding facility at Potrero Point in San Francisco, California

Introduction
Historical Overview
Visiting Union Iron Works
Nearby Attractions and Visitor Tips
FAQ
Visuals and Resources
Conclusion
References

Historical Overview

Founding and Early Development (1849–1880s)

Union Iron Works began as Union Brass & Iron Works, established by Peter Donahue in 1849 during the California Gold Rush. The foundry supplied iron castings and machinery for mining, railroads, and agriculture, quickly becoming integral to San Francisco’s emerging industrial sector. By the 1860s, the company expanded into locomotive repair and construction, playing a key role in California’s transportation infrastructure (Pier 70 History; Bethlehem Shipyard Museum).

In 1864, Donahue sold the company and focused on gas works, which later became Pacific Gas & Electric (PG&E). Leadership then transitioned to Irving M. Scott, who guided the company towards shipbuilding—a move that shaped its legacy.

Shipbuilding and Potrero Point Relocation

Under Scott’s direction, Union Iron Works relocated to Potrero Point in the 1880s, an industrial hub with deep-water access essential for building and launching large vessels (Dreadnought Project). This move enabled the company to expand its shipbuilding operations significantly.

Steel Shipyard Milestones

By 1884, Union Iron Works had established the first steel shipyard on the West Coast, launching the “Arago”—the first steel-hulled ship built in the Pacific region (NoeHill). The company’s shipyard produced notable vessels including the USS Charleston, USS Olympia, and USS Oregon, which became pivotal assets during the Spanish-American War.

Naval and Industrial Significance

Union Iron Works became a premier shipbuilder for the U.S. Navy and commercial fleets, contributing to naval modernization in the late 19th and early 20th centuries. The company was acquired by Bethlehem Steel in 1905, continuing to operate under the Union Iron Works name until 1917, and remaining vital during both World Wars (Bethlehem Shipyard Museum).

Preservation and Legacy

Today, many original buildings—including the 1883 machine shop—are preserved as part of the Pier 70 Historic District. The site, now operated by BAE Systems, is the longest-running privately owned shipyard in the U.S., and a significant chapter in San Francisco’s industrial heritage (Pier 70 History; Bethlehem Shipyard Museum).

Visiting Union Iron Works

Location and Transportation

Union Iron Works is situated within the Pier 70 complex, bordered by 20th Street, Illinois Street, and the San Francisco Bay, in the Dogpatch neighborhood.

Public Transit: Take Muni’s T Third Street light rail to 20th or 23rd Street stations. Bus routes 22-Fillmore and 48-Quintara also serve the area.
Biking/Walking: The Bay Trail and local bike lanes provide scenic access.
Driving: Limited street parking is available—public transportation or rideshare is recommended during busy events.

Visiting Hours and Tickets

General Access: The outdoor historic district is open year-round during daylight hours, typically 9:00 AM to 5:00 PM. Specific buildings may only be accessible during special events or guided tours.
Admission: Outdoor access is free. Guided tours and special exhibitions may require tickets or advance reservations, usually ranging from $10–$20, with discounts for seniors, students, and children.
Check: Confirm up-to-date hours, ticketing, and event schedules via the Pier 70 Official Website or Bethlehem Shipyard Museum.

Accessibility

The site is designed to accommodate visitors with mobility challenges, featuring paved walkways and ramps. Some historic structures may have limited access due to ongoing restoration. Contact event organizers for specific accessibility details.

Guided Tours and Events

Guided Tours: Scheduled tours provide in-depth insights into the shipyard’s history and architecture. These are often available during citywide festivals or by appointment (FoundSF).
Special Events: The site hosts art fairs, food festivals, live music, and heritage walks throughout the year. Check local event calendars like SF Travel and Secret San Francisco for current happenings.

Photography

Photography is encouraged for personal use. The industrial architecture, historic cranes, waterfront views, and dramatic lighting make Union Iron Works a favorite for photographers. Commercial shoots require prior approval (Pier 70 Official Website).

Nearby Attractions and Visitor Tips

Crane Cove Park: A waterfront park adjacent to Pier 70, ideal for recreation and bay views.
Dogpatch Neighborhood: Known for its historic architecture, art galleries, and vibrant food scene.
Mission Bay & The Embarcadero: Explore nearby promenades, the Chase Center, and the iconic waterfront boulevard.
San Francisco Maritime National Historical Park: Discover maritime history at Fisherman’s Wharf (San Francisco Maritime National Historical Park).

Travel Tips:

Wear comfortable shoes for walking.
Bring layers for changing waterfront weather.
Supervise children near industrial remnants and waterfront edges.
Visit during special events for the fullest experience.

Frequently Asked Questions (FAQ)

Q: What are the visiting hours for Union Iron Works?
A: The outdoor site is open during daylight hours year-round. Tours and event access may vary; check Pier 70 Official Website for updates.

Q: Is there an entry fee or ticket required?
A: Outdoor areas are free; some tours and special events may require tickets.

Q: Are guided tours available?
A: Yes, during select events and by arrangement with local historical organizations.

Q: Is Union Iron Works accessible to visitors with disabilities?
A: Most areas are accessible, but some historic buildings may have restricted access.

Q: Can I bring children?
A: Yes, families are welcome. Supervise children closely for safety.

Q: Can I take photos at Union Iron Works?
A: Yes, personal photography is allowed. Commercial photography requires advance approval.

Visuals and Resources

For enhanced planning and engagement, explore high-quality images, maps, and virtual tours on the Pier 70 Official Website and Bethlehem Shipyard Museum. Use descriptive alt tags for SEO, such as “Union Iron Works historic powerhouse building” and “Pier 70 shipyard cranes San Francisco waterfront.”

Conclusion

Union Iron Works stands as a testament to San Francisco’s industrial legacy, labor history, and cultural diversity. Its preserved shipyard, historic architecture, and vibrant event calendar offer visitors a unique connection to the city’s past and present. Whether attending a festival, joining a guided tour, or simply exploring the waterfront, Union Iron Works provides a rewarding destination for history buffs, families, and cultural explorers alike.

Plan your visit by checking current hours and events on the Pier 70 Official Website and related local resources. Enhance your experience with the Audiala app for guided tours and stay connected through social media for updates and special offerings.