Necanicum River
| Necanicum River | |
 The river as it flows through Seaside near its outlet to the Pacific Ocean
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| Country | United States |
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| State | Oregon |
| County | Clatsop |
| Source | Northern Oregon Coast Range |
| - location | Humbug Mountain, Clatsop County, Oregon |
| - elevation | 1,847 ft (563 m) |
| - coordinates | 45°55′37″N 123°42′30″W / 45.92694°N 123.70833°W |
| Mouth | Pacific Ocean |
| - location | At Seaside, Clatsop County, Oregon |
| - elevation | 7 ft (2 m) |
| - coordinates | 46°0′41″N 123°55′39″W / 46.01139°N 123.92750°WCoordinates: 46°0′41″N 123°55′39″W / 46.01139°N 123.92750°W |
| Length | 21 mi (34 km) |
| Basin | 83.7 sq mi (217 km2) |
  Location of the mouth of the Necanicum River in Oregon
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The Necanicum River is a river on the Pacific coast of northwest Oregon in the United States, approximately 21 miles (34 km) long. It drains a timber-producing area of the Northern Oregon Coast Range northwest of Portland. It forms the first estuary south of the mouth of the Columbia River along the Oregon Coast, reaching the Pacific Ocean at Seaside in Clatsop County.
Necanicum is one of several Indian names in northwest Oregon beginning with ne, meaning place. Necanicum is derived from Ne-hay-ne-hum, the name of an Indian village once on the stream. William Clark named it Clatsop River on January 7, 1806, but the name did not stick. The river was also once known as Latty Creek, for William Latty, an early pioneer in the southern part of Seaside.
The Necanicum River rises south of Humbug Mountain (not to be confused with the Humbug Mountain in southwestern Oregon), in south central Clatsop County and south of the Saddle Mountain State Natural Area. The elevation of the river's source is approximately 1,847 feet (563 m). It flows generally west, along U.S. Route 26. Approximately 3 miles (4.8 km) from the coast, east of Tillamook Head, it turns north. The river enters the Pacific Ocean at Seaside. Its final approach to the ocean is nearly parallel to the coast running south to north through the downtown of Seaside.
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Wikipedia