Fernbridge
Also known as: Eel River Bridge
Why it's listed
Spanning the Eel River on State Route 211, Fernbridge is a reinforced concrete arch bridge more than 2,400 feet long, linking the Eel River valley and Ferndale with Highway 101. Completed in November 1911 after years of petitions by valley residents who were cut off by winter floods, it has seven earth-filled spandrel arch spans of 196 feet each, the longest of that design in California. Designed under County Surveyor George Conners and attributed to engineer John B. Leonard, it was built by the Pacific Construction Company on timber-pile foundations. Wooden approaches were replaced with concrete ones in 1920. The bridge withstood the major floods of 1955 and 1964, though the south end was shortened by 20 feet after the first. It was recognized as a civil engineering landmark in 1976 and is valued for its engineering, durability and appearance, and for its role in the valley's dairy economy.
Significance in brief: The nomination argues it was an outstanding engineering feat when built in 1911, and its 196-foot spans remain the longest of their type in California. It has survived major floods in 1955 and 1964 and retains a high degree of historic integrity. It was named a California Historic Civil Engineering Landmark in 1976 and ranked first among earth-filled spandrel arch bridges in a 1986 state survey.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 87000566, listed April 2, 1987. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | CA 211, Fernbridge |
|---|---|
| County | Humboldt County |
| Listed | April 2, 1987 |
| Reference number | 87000566 |
| Resource type | Structure |
| Architect / builder | 1911: George W. Conners, County Surveyor; John B. Leonard, Consulting Engineer; Pacific Construction Company. 1920: A.J. Logan, County Surveyor; H.J. Brunnier, Consulting Engineer; Padgett and Kelly, Contractor |
| Areas of significance | Engineering |
| Level of significance | State |
| Status (as stated in the nomination) | Described as in good condition, occupied and in use as a public transportation structure, with the state considering its condition and alternatives at the time of nomination. |
| Acreage | 1.4 |
| Coordinates | 40.61410, -124.20327 (NPS GIS) |
What listing means for this property
National Register listing is honorary: it recognises significance and does not restrict what a private owner may do without federal money or permits. It unlocks the 20% federal rehabilitation tax credit for income-producing buildings, state credits in many states, and Section 106 review when federal agencies are involved. See what listing means in practice.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 87000566.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q5445038
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.