Biohazard and Pathogen Disinfection in Idanha, OR

Idanha is an incorporated city straddling the Marion County-Linn County line in Oregon, on Oregon Route 22 and the North Santiam River, which forms the county line and separates the two settled areas within the city limits; the dataset lists Marion County only, but the city actually spans both counties, with the Linn County side shown on U.S. Geological Survey maps as New Idanha.

The 2020 census counted 156 residents in Idanha, living in 74 households, and the city's median age was 49.5 years.

The North Santiam River corridor was used by the Santiam Kalapuya for travel, food gathering, and trade, and the locality at present-day Idanha was originally known as Muskrat Camp.

A hotel proprietor serving travelers, anglers, and hunters adopted the name Idanha from a mineral-water brand bottled in Soda Springs, Idaho.

The Oregon Pacific Railroad reached Idanha at the end of December 1889, and as the eastern terminus of the completed line the town became a departure point for hunting and fishing excursions into the Cascades.

In 1949 residents rejected a joint municipality with nearby Detroit and approved Idanha's separate incorporation by a vote of 190 to 8, with the Marion County court certifying the result in December 1949 and the Oregon Blue Book listing March 15, 1950, as the city's official incorporation date.

Construction of Detroit Dam, begun in 1949 and completed in 1953, supported the expansion of Idanha's postwar timber industry, though area mills had largely closed by the mid-1990s and the local economy shifted toward outdoor recreation and travelers bound for Detroit Lake and the Santiam Pass.

Idanha was one of the small Santiam Canyon cities hit by the Santiam Fire in September 2020, when strong east winds drove the Lionshead Wildfire through the canyon on the night of September 7-8, 2020, forcing chaotic evacuations.

Idanha is served by the Santiam Canyon School District, and its ZIP code is 97350.