(unnamed)

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(unnamed) flows into Illinois River , which it joins at N 42° 24′ 45″, W 124° 0′ 46″ at OSM node n1024722712, and there 4,487 km of total upstream flows in. load it's distributaries

(unnamed) has 3 tributaries.

• South Fork Collier Creek, which joins it at N 42° 22′ 34″, W 124° 4′ 41″ at OSM node n1024037330, and 46 km of total upstream flows in.
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• North Fork Collier Creek, which joins it at N 42° 24′ 19″, W 124° 1′ 38″ at OSM node n1025061342, and 43 km of total upstream flows in.
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• Collier Creek, which joins it at N 42° 22′ 30″, W 124° 5′ 48″ at OSM node n1025212684, and 11 km of total upstream flows in.
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