| IBA |
Big Muddy Lake (and surroundings)
Southcentral Saskatchewan, Saskatchewan |
| Site Summary |
| SK018 |
Latitude
Longitude |
49.157° N
104.857° W |
Elevation
Size |
659 - 671 m
200.01 km² |
Habitats:
deciduous woods (temperate), scrub/shrub, native grassland, inland saline lake, cliffs/rocky shores (inland)
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Land Use:
Agriculture, Nature conservation and research, Rangeland/pastureland, Tourism/recreation
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Potential or ongoing Threats:
Agricultural pollution/pesticides, Drought, Grazing, Intensified management, Interactions with native species/disease, Other decline in habitat quality
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| IBA Criteria: Nationally Significant: Threatened Species |
| Conservation status: |
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Site Description
Big Muddy Lake is a large saline lake in the semi-arid region of southern Saskatchewan. It is located about 24 km south of the town of Bengough and 12 km north of the Montana border. The lake is situated in the rugged Big Muddy Valley, and was once part of a great river that flowed out of a glacial lake in the Old Wives Lake area, and south to the Missouri River in Montana. The lake is mostly filled by the Big Muddy Creek at the northwest end, but dozens of intermittent creeks also run into the lake through eroded coulees. This region contains a wide variety of habitats that include alkaline flats, marshy creeks and springs, steep eroded cliffs with exposed rock outcrops, undulating and rolling prairie uplands, heavily wooded draws, sage flats and some cropland. A large co-operatively owned pasture borders a portion of the west shore of the lake.
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Birds
The lakeshore supports a large and important Piping Plover population. The Piping Plover is considered near threatened on a global scale and has been designated as endangered in Canada. The 1996 International Piping Plover Survey recorded 1,687 birds in the Canadian Prairies and 4,226 additional birds throughout the rest of North America. Between 1986 and 1996 an average of 21 plovers (2% of the Central Canadian population) have been recorded at Big Muddy Lake with a high of 34 (3.3%) in 1996. The most recent survey in 2016 observed 5 pairs, and 14 birds, loewr than average. The lake also supports as many as 5,000 ducks that congregate here in the fall and during the summer moulting period. The mixed habitats surrounding the lake support rich communities of land birds, particularly raptors. The badlands here support some of the highest concentrations of breeding Golden Eagles, Prairie Falcons and Turkey Vultures in the province. Six Prairie Falcon nest sites are also known (2.4% of the Canadian population), although not all are used every year. Two nesting sites of the nationally vulnerable Ferruginous Hawk and two nesting sites of the nationally endangered Burrowing Owl are also present. The nationally endangered Sage Thrasher has also been observed once during the breeding season, suggesting that nesting by this species is possible in the sage flats. Since the Canadian population is estimated to be only 5 to 22 pairs, a single pair is important. The badlands and wooded coulees provide habitat for several regionally uncommon species such as Violet-green Swallow, Rock Wren, Veery, Ovenbird, Baltimore Oriole, and Spotted Towhee. Other Biodiversity The Eastern Yellow-bellied Racer and the Smooth Greensnake are two reptiles found here that are at the northern limit of their range. Also, several plants that are unusual for southern Saskatchewan have been recorded: Purple Cliff Brake, Linear-leaved Umbrellawort, and Oregon Woodsia.
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IBA Criteria |
| Species↓ T | A | I |
Links |
Date |
Season |
Number |
G |
C |
N |
| Piping Plover |
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1991 - 2011 |
SU |
16 - 34 |
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✔ |
✔ |
| Sage Thrasher |
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1995 |
SU |
2 |
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✔ |
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Note: species shown in bold indicate that the maximum number exceeds at least one of the IBA thresholds (sub-regional, regional or global). The site may still not qualify for that level of IBA if the maximum number reflects an exceptional or historical occurrence.
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Conservation Issues
All of the eastern half of the lake, as well as a few other small sections, are designated as Critical Piping Plover Habitat. This designation protects the shoreline to the high water mark from development through the provincial Wildlife Habitat Protection Act. Big Muddy Lake was identified as a candidate wildlife area under the International Biological Programme (1964-1974). This designation does not provide legal protection, but highlights the ecological importance of the site. Drought from low spring runoff and lack of seasonal rains is always a potential problem in this arid region. Increased salinity from lower water levels may affect primary productivity and subsequent use by birds. Overgrazing could also become a problem due to the large number of cattle grazing in this region.
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