The Codd Wetland property provides some of the most ecologically significant habitat in the Lower mainland.  Hundreds of fish, reptiles, and terrestrial species use the wetlands at some point in their lifecycle or at some time of the year.  Local naturalists first took special note of the wetlands when the red-listed Greater Sandhill Crane was found to be using the area as a nesting site.  This endangered species numbers are thought to be as low as 10 in the Pitt Polder region.  At this critical level of decline the continued presence of intact nesting sites is essential to their local survival.  Some additional mammals of note using the area include the red- listed Peregrine Falcon and Lon- tailed Weasel, the blue-listed American Bittern and Red-legged Frog.  For species like the Pacific Water Shrew and American Bittern the wetlands provide some of the best intact, undisturbed habitats remaining within British Columbia.  For other rare and endangered species such as the Green Heron, Great Blue Heron, and the Red-legged frog the wetlands also provide important breeding habitats.

Along with all the mammals and reptiles using the area significant populations of Salmon species including the blue-listed Cutthroat Trout, Coho Salmon, and Chum Salmon utilize the wetlands and associated creeks for spawning and rearing.  The Codd Wetland along with the Blaney Bog located just 2 km upstream provide the largest off-channel rearing habitat within the Alouette River watershed and one of the last in the lower reaches of the Fraser River.  According to Ministry of Water, Land, and Air Protection staff, 2/3 of the Fraser Rivers 187 wild Coho Salmon stocks rely on habitat found downstream from Hope.  The Codd Wetland property is downstream of Hope and it provides ideal rearing habitat for juvenile Coho including a network of low gradient open water channels, temporarily inundated floodplains, a continuous supply of well oxygenated water, lush plant communities and an abundant insect food supply.  Excellent rearing habitat is also available for juvenile blue-listed Cutthroat Trout as they have similar habitat requirements to those of juvenile Coho Salmon.