Chehalis River Estuary (11062)
Canada, North America
Site overview
KBA status: confirmed
Global KBA criteria: D1a
Year of last assessment: 2008
National site name: Chehalis River Estuary
Central coordinates: Latitude: 49.2763, Longitude: -121.9347
System: freshwater, terrestrial
Elevation (m): 10 to 20
Area of KBA (km2): 31.97644
Protected area coverage (%): 28.48
KBA classification: Global
Legacy site: Yes
Site details
Site description: This site is located where the Chehalis River empties into the lower Harrison River, just upstream from its junction with the Fraser River. The town of Harrison Mills is nearby, and Chilliwack is about 10 kilometres to the south. The Chehalis River enters the Harrison River in a broad fan of meandering channels and mudflats. Sedge marshes cover much of the open habitat at the mouth of the Chehalis River, while the Harrison River is bordered by linear stands of large Black Cottonwood, Western Redcedar and Douglas-fir. The site is within the lower Fraser Valley, a broad floodplain (~15 km wide) bordered on the north by the granitic Coast Mountains and on the south by the Cascade Mountains. Coho and Chum Salmon have a winter spawning run here.
Rationale for qualifying as KBA: This site qualifies as a Key Biodiversity Area of international significance that meets the thresholds for at least one criterion described in the Global Standard for the Identification of KBAs.
Additional biodiversity: This area attracts large numbers of Bald Eagles from December through February, which feed on spawning Coho and Chum Salmon. Exact peak numbers are difficult to obtain, but 400 to 500 are regularly seen from the Harrison Mills bridge on Highway 7 in mid-January, and the area total is generally around 1,000 birds at that time (1% of the global population). The total on the Christmas Bird Count in this area in December, 1997, was 1,235 birds. This eagle concentration is globally significant and is perhaps the third largest in the world after the Chilkat River, Alaska, and Squamish River, British Columbia. Trumpeter Swans of the Pacific population are also present in globally significant numbers, with 413 being seen in the area during the 1997 Christmas Bird Count. This represents 2% of the worlds population of this species. Numerous other waterfowl species use the area in winter also.
Delineation rationale: 2011-06-06 (BL Secretariat): site area updated from 1600 ha to 3200 ha, following GIS analysis of site polygon by Bird Studies Canada (J. Moore & S. Marquez in litt. 2009).
Habitats
Land use: agriculture | forestry | hunting | nature conservation and research | rangeland/pastureland
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Forest | 20 | |
| Wetlands(Inland) | 80 |