Site description (2001 baseline)
The Riverton Sand Islands are located off the western shore of Lake Winnipeg near the community of Riverton (directly west of Hecla Island). They consist of a series of three small islands extending between Riverton Marsh eastward toward Sand Point on Hecla Island. The islands are comprised of sand and gravel that has been partially colonized by grasses and willows. The closest island is located only 50 metres from shore and is connected to the mainland by a sandbar during low water years. Sand Point on Hecla Island is also included within this site.
This site supports significant concentrations of Ring-billed Gulls and Common Terns. About 1% (10,000 nests) of the world's estimated Ring-billed Gull population were present in 1991. In addition, a total of 800 Common Tern nests, or about 2% of the estimated North American population were present on Sand Islands #2 and #3. Nesting Herring Gulls were also present, with 153 nests being recorded in 1991. The Sand Point on Hecla Island is also noted as a major roost site for pelicans, gulls and terns.
There are also occasional records of nesting Piping Plovers (nationally endangered and globally vulnerable) on the Riverton Sand Islands and on the adjacent Hecla Island Sand Point. During the 1991 International Piping Plover census one pair of Piping Plovers was recorded at each site, while during the 1996 International census only a single pair of Piping Plovers was recorded at the Hecla Island Sand Point.
In addition to the importance of these islands and sandspits to nesting birds, they are also heavily used by several species during migration. The area is reportedly a major concentration site for migrating Canada Geese and Snow Geese although the numbers have not been documented. It has also been reported that hundreds of migrating Sanderlings use the site along with lesser numbers of Ruddy Turnstones and other shorebirds.
BirdLife International (2023) Important Bird Area factsheet: Riverton Sandy Bar. Downloaded from http://datazone.birdlife.org/site/factsheet/riverton-sandy-bar-iba-canada on 09/12/2023.