Alexander-Acacia Bridge
Also known as: Alexander Avenue Overhead; Bridge No. 27C-150
Why it's listed
Alexander-Acacia Bridge carries Alexander Avenue across the former Northwestern Pacific Railroad right of way in Larkspur, California. Built between 1925 and 1927, it measures 163.5 feet long and 29 feet wide. Seven reinforced concrete slab spans make up the structure, and the main span is a through arch holding the deck on suspended pillars and transverse floor beams. Engineer John C. Oglesby is named as its designer, and Pacific States Construction Company won the contract with a bid of $49,927.32. The bridge replaced a lighter wooden crossing and connected older Larkspur with the new Palm Hill Tract. Property owners in the improvement district were assessed the cost, which prompted protests from residents, a bank and the railroad, all of which were denied. It is one of only five reinforced concrete through-arch bridges known in California, all from the mid to late 1920s. Today it still serves as the main vehicle route into the Palm Hill Tract.
Significance in brief: The nomination argues the bridge represents a type (reinforced concrete through arch), a period (1920s) and a method of construction (poured-in-place reinforced concrete). It is one of only five such bridges known in California. It also played an important, if controversial, role in developing the Palm Hill Tract by linking it to older Larkspur.
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 84000903, listed January 5, 1984. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | Alexander Ave. between Acacia and Monte Vista Aves., Larkspur |
|---|---|
| County | Marin County |
| Listed | January 5, 1984 |
| Reference number | 84000903 |
| Resource type | Structure |
| Period of significance | 1925-1927 |
| Architect / builder | Engineer: John C. Oglesby; built by Pacific States Construction Company of San Francisco |
| Areas of significance | Community Planning and Development, Engineering, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | Still in its original function, providing the Palm Hill Tract with its primary vehicular access to downtown Larkspur. Condition is marked fair and the site is occupied/in use. |
| Acreage | 0.9 |
| Coordinates | 37.93013, -122.53183 (NPS GIS) |
What listing means for this property
For a publicly owned building or structure, listing mainly matters when federal funds, permits or licences are involved: projects then go through Section 106 review so effects on the property are considered. Listing also strengthens applications for preservation grants and, for leased income-producing uses, can enable the federal rehabilitation tax credit.
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 84000903.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q111843050
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.