Ada County is named for Ada Riggs, who was the first child born in the area and the daughter of H C Riggs, one of the founders of Boise.
Created: December 22, 1864
Boise 1864 – present
County Courthouse – Boise
Location: 200 West Front Street / South 3rd Street
Built: 2000 – 2002
Architect: Lombard-Conrad Architects and HDR Architects
Contractor: Morrison Knudsen
Description: The building faces south and is a five story concrete and glass structure.
Old County Courthouse – Boise
Location: 514 West Jefferson Street / 6th Street
Built: 1938 – 1939
Style: Art Deco
Architect: Tourtelette & Hummel and Wayland & Fennet
Contractor: J O Jordan & Son and Jordan Wilcomb.
Description: The building faces south and is an eight story Indiana limestone structure. The base is three stories high and the central tower is eight stories. The interior has murals painted by Ivan Bartlett in a vernacular style which depict the history of the Western Expansion into Idaho and are perfect examples of the depression-era frugality seen across the nation at the time. The building was a Works Progress Administration project. The building has been purchased by the State of Idaho and is being renovated. The architect is LKV Architects ( Leatham Krohn Van Ocker )
Note: The previous courthouse was built in 1882. An addition was constructed in 1909. The cost of construction of the present courthouse was $47,000,000.
See: The Idaho Supreme Court is located in the county.
E – Elmore County
Photos taken 1996, 2004 and 2015