South Fork Umatilla River
river in the United States of America
The South Fork Umatilla River is a tributary of the Umatilla River in Umatilla County in the U.S. state of Oregon. Its headwaters lie in the Umatilla National Forest in the Blue Mountains of northeastern Oregon near Pileup Saddle and Black Mountain. The South Fork flows generally north between Goodman Ridge and Bobsled Ridge to meet the North Fork Umatilla River near Graves Butte. Together the forks form the main stem Umatilla.
Named tributaries of the South Fork from source to mouth are Shimmiehorn, Thomas, and Buck creeks, which all enter from the right. The North Fork also enters from the right.
The Umatilla Forks Campground and Day Use Area lies near the confluence of the forks. Open from June through September, it has campsites, picnic tables, toilets, drinking water, and parking spaces. Forest Road 32 runs along the lower river below the mouth of Thomas Creek.
“South Fork Umatilla River” enters the record as river in the United States of America. Crown Archives preserves that source wording while asking what South, Fork and Umatilla can confirm, complicate or overturn.
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“South Fork Umatilla River” is worth following because a concise public description often conceals a longer documentary argument. Here, South, Fork and Umatilla provides the most credible route into that argument.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Aug 6, 2026. The linked authority identifier is Q22954134. Authority coordinates are 45.726, -118.188. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “South Fork Umatilla River” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.