HydroBASINS lev08 watershed · #7080392520
Bassin de St. Marys River
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 5 administrative regions across 2 countries : Algoma, Chippewa, Lake Hurron, Mackinac
Sub-basin area
2 256,6km²
Upstream area
214 026,6km²
Discharge
4 541m³/s
Mean elev.
195m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Garden River2134 km²
- Bassin de St. Marys River1015 km²
5 dept-equivalent regions (GADM L2)
- 1155.8 km²51.1% of basin
- 577.3 km²25.5% of basin
- 260.7 km²11.5% of basin
- 134.8 km²6.0% of basin
- 133.6 km²5.9% of basin
30 intersecting protected areas
State Forest
232.14 km² overlap
Marine Protected Area
95.61 km² overlap
Munuscong
IUCN VState Wildlife Management Area
57.46 km² overlap
Marine Protected Area
35.14 km² overlap
Reserve Program
12.20 km² overlap
Migratory Bird Sanctuary
9.86 km² overlap
Reserve Program
4.50 km² overlap
Harbor Island
IUCN IVNational Wildlife Refuge
2.98 km² overlap
Marine Protected Area
2.88 km² overlap
21 more protected areassorted by overlap area
Roach Point
IUCN VNature Preserve
2.58 km² overlap
Maxton Plains Fee
IUCN VPrivate Conservation Land
2.35 km² overlap
Carlton Lake
IUCN VWetlands
1.29 km² overlap
NGO/Land Trust/Agency - Fee Simple Property
1.20 km² overlap
Privately Protected Area
1.20 km² overlap
Roach Point
IUCN VNature Sanctuary
1.14 km² overlap
State Wildlife Management Area
0.65 km² overlap
MNRTF Parcel 115
IUCN VConservation Area
0.55 km² overlap
Natural Area
0.50 km² overlap
Hay Marsh Nature Reserve
IUCN IaNGO/Land Trust/Agency - Fee Simple Property
0.42 km² overlap
Hilton Township Wilderness Area
IUCN IIIWilderness Area
0.41 km² overlap
Williams
IUCN VNature Preserve
0.32 km² overlap
Agricultural Conservation Easement Program - Wetland Reserve Easements (ACEP-WRE), Chippewa, MI
IUCN Not AssignedConservation Easement
0.26 km² overlap
Farm Service Agency Interest Of Mi
IUCN Not AssignedConservation Easement
0.19 km² overlap
Curtis Anderson
IUCN VNature Preserve
0.19 km² overlap
95-04-0291
IUCN Not AssignedConservation Easement
0.18 km² overlap
Munuscong Bay
IUCN VNature Preserve
0.17 km² overlap
98-04-0243
IUCN Not AssignedConservation Easement
0.13 km² overlap
Conservation Area
0.11 km² overlap
Bellevue Island Fee
IUCN VPrivate Conservation Land
0.11 km² overlap
97-04-0138
IUCN Not AssignedConservation Easement
0.10 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 243 distinct species · 223 825 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de St. Marys River : 21 espèces reliées par 76 interactions GloBI sur 4 types (connectance 15.3%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
4,8°C
Annual rain
811mm
Moisture idx (CMI)
0,04
Runoff
261mm/an
PET
782mm
AET
598mm
Mean slope
0,7°
Water table
66cm
Forest
47%
Crops
7%
Urban
0%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)