The wetlands of Widgeon Valley feature lodgepole pine interspersed within a diverse collection of shrubby vegetation, most notably Labrador tea and horsetail.

The red cedar and hemlock trees were quite vast and popular as they were often harvested and used by the Katzie for hunting, trading, and gathering purposes.

[6] Aquatic migratory birds such as the Canada goose, and several varieties of duck; mallard, wood, and cinnamon teal occupy the valley's water system.

[6] The aquatic ecosystem supports fish such as steelhead, cutthroat trout, and a unique population of sockeye salmon that have adapted to the water system's tidal conditions.

[13] Amphibians such as northwestern salamanders, rough skinned newts and red legged frogs can be found in the Widgeon Valley's large marsh.

[13] Larger fauna include beaver, river otter, with cougars, bobcats, black bears, and deer also frequenting the area.

[15] In some regions such as Metro Vancouver, where human activities and habitat destruction is of a high degree, the western screech owl has been extirpated.

[6] Climate change poses a significant threat to the western screech owl through habitat destruction and resource depletion.

[13] Increased frequency of extreme weather such as storms and floods fell trees used as shelter by the Western Screech owl.

[13] The widgeon valley hosts trees such as douglas fir, sitka spuce, red abig-leaf, and big leaf maple.

Hemlock and red cedar make up the older population being considered second growth while big leaf maple trees in the area are significantly younger.

[5] In 1940, two logging companies sold the land that would become The Widgeon Valley National Wildlife Area to the Burnett family.

[5] Plans approved in 2019 by the Metro Vancouver Regional District include opening the Widgeon Valley National Wildlife Area to the public.

[7] The protected area is located in a broad, flat-bottomed valley immediately west of the south end of Pitt Lake.

The existence of high elevated banks of riverine and tidal sloughs supports riparian shrub species and some trees.

The high occurrence of tidal sloughs has created so many channels and allowed the scattering of open ponds throughout the interior with its connection to the river.