# Minnesota Minnesota is the 32nd U.S. state (admitted May 11, 1858), 225,163 km² of glacially planed bedrock and till sitting on the hydrological crown of North America. No other state sheds its runoff to three different seas: south down the [[Mississippi_River]] to the Gulf of Mexico, north via the [[Red_River_of_the_North]] and the [[Rainy_River]] toward Hudson Bay, and east through [[Lake_Superior]] and the Great Lakes to the Atlantic. That triple partition — plus roughly 11,800 lakes larger than 4 ha and about 111,000 km of streams ([[List_of_lakes_of_Minnesota]], [[List_of_rivers_of_Minnesota]]) — makes the state the reference landscape for this vault's river articles: nearly every entry from the [[Temperance_River]] to the [[Blue_Earth_River]] drains a piece of it. Population ≈5.71 million (2020 census); capital St. Paul; highest point Eagle Mountain at 701 m, barely 20 km from the 183 m surface of [[Lake_Superior]] — total relief of a modest hill, yet enough to route [[Water]] to three oceans. ## Three basins, two divides The Laurentian Divide crosses the state's northeast, separating Hudson Bay drainage from Atlantic-bound flow; a second, subtler divide splits Hudson Bay water from the Gulf. The three meet at a triple point on the Giants Range near Hibbing — the "Hill of Three Waters." Roughly six-tenths of the state drains to the Gulf ([[WT!Minnesota_Gulf_of_Mexico_Basin]]): the [[Mississippi_River]] rises at Lake Itasca (≈450 m) and collects the [[Crow_Wing_River]], [[Rum_River]], [[St._Croix_River]], [[Cannon_River]], [[Zumbro_River]], and [[Root_River]], while the [[Minnesota_River]] brings in the prairie tributaries; the far southwest corner leaks to the [[Missouri_River]] through the [[Rock_River]] and [[Little_Sioux_River]]. Roughly a third goes north ([[WT!Minnesota_Hudson_Bay_Basin]]): the [[Bois_de_Sioux_River]] and [[Otter_Tail_River]] join at Breckenridge to form the Red, and border-lakes water passes through [[Rainy_Lake]] and the [[Rainy_River]] to Lake of the Woods, then out the [[Winnipeg_River]] and [[Nelson_River]]. Under a tenth drains to [[Lake_Superior]] ([[WT!Minnesota_Great_Lakes_Basin]]), yet from Duluth a ship can still reach the Atlantic after ≈3,770 km of lakes, locks, and seaway. ## What the ice sheet left Nearly all of this is Pleistocene work. Lobes of the Laurentide Ice Sheet — Superior, Rainy, and Des Moines lobes among them — repeatedly buried the state, and the last retreat (~11,700 years ago) left young, undissected drift whose deranged drainage is why the lakes exist at all. Meltwater ponded against the retreating margin as Glacial Lake Agassiz, the largest of the proglacial lakes; its dead-flat lakebed is today's Red River Valley, and its southern outlet, Glacial River Warren, cut the huge trench now occupied by the underfit [[Minnesota_River]]. Warren's incision left tributaries like the [[Blue_Earth_River]], [[Le_Sueur_River]], and [[Cottonwood_River]] hanging, and their knickpoints are still migrating headward. Agassiz finally drained toward Hudson Bay around 8,200 years ago. In the southeast, beyond the reach of the youngest lobes, the [[Root_River]], [[Whitewater_River]], and [[Zumbro_River]] have incised deep, spring-fed valleys into Paleozoic strata — the state's only rugged fluvial [[Geomorphology]]. ## Bedrock from 3.5 billion years to the Midcontinent Rift The basement is Canadian Shield: the Morton gneiss exposed in the lower [[Minnesota_River]] valley dates to ≈3.5 Ga, among the oldest rocks on the continent, with Archean greenstone belts to the north. Around 1.9 Ga the Biwabik banded iron formation was laid down; its Mesabi Range ores made the state the dominant U.S. source of [[Iron_ore]], now shipped as taconite pellets. About 1.1 Ga the Midcontinent Rift nearly split the continent, flooding the North Shore with basalt and emplacing the Duluth gabbro — the tilted volcanic edge over which [[Gooseberry_River]], [[Baptism_River]], [[Temperance_River]], [[Cascade_River]], and [[Devil_Track_River]] step in waterfalls and gorges on their short, steep runs to [[Lake_Superior]], and over which the border [[Pigeon_River]] drops in the state's tallest falls. The rift basin itself holds the lake: a 1.1-billion-year-old scar in the [[Crust_(geology)]] full of glacial meltwater. ## The river inventory, basin by basin | Basin (outlet sea) | Mainstems | Vault tributaries (examples) | | --- | --- | --- | | Gulf of Mexico | [[Mississippi_River]], [[Minnesota_River]] | [[Sauk_River]], [[Crow_River]], [[Redwood_River]], [[Yellow_Medicine_River]], [[Chippewa_River]], [[Lac_qui_Parle_River]], [[Pomme_de_Terre_River]], [[Watonwan_River]]; south-flowing [[Des_Moines_River]], [[Cedar_River]], [[Upper_Iowa_River]] | | Hudson Bay | [[Red_River_of_the_North]], [[Rainy_River]] | [[Red_Lake_River]], [[Wild_Rice_River]], [[Buffalo_River]], [[Sand_Hill_River]], [[Thief_River]], [[Roseau_River]], [[Warroad_River]]; [[Big_Fork_River]], [[Little_Fork_River]], [[Vermilion_River]], [[Kawishiwi_River]] | | Atlantic (via Superior) | [[St._Louis_River]] | [[Cloquet_River]], [[Whiteface_River]], [[Nemadji_River]]; North Shore streams [[Lester_River]], [[French_River]], [[Knife_River]], [[Split_Rock_River]], [[Manitou_River]], [[Caribou_River]], [[Poplar_River]], [[Brule_River]] | The [[St._Louis_River]] is Superior's largest U.S. tributary; the [[St._Croix_River]] and [[Mississippi_River]] frame the Wisconsin border, the Red the North Dakota line. ## Climate, water balance, flood mechanics The climate is severely continental: recorded extremes run from −51 °C (Tower, February 1996) to +46 °C (Beardsley, July 1917). Mean annual precipitation climbs from ≈48 cm in the northwest to ≈81 cm in the southeast, and lakes carry ice for four to five months. The flood regimes differ by basin mechanics. The [[Red_River_of_the_North]] flows north at gradients of mere centimeters per kilometer across the Agassiz lakebed, so spring thaw sends water toward still-frozen downstream reaches and it spreads laterally for kilometers (catastrophically in 1997). North Shore streams like the [[Knife_River]] and [[Baptism_River]] are the opposite: small bedrock basins that flash within hours of rain or melt. Prairie rivers such as the [[Cottonwood_River]] and [[Hawk_Creek]] swing between trickle and torrent with the [[Atmosphere_of_Earth]]'s continental air-mass seesaw. ## State fundamentals The name is Dakota — *mní sóta*, usually glossed "clear" or "sky-tinted" water — fitting for a polity whose emblems, borders, and economy are hydrological. St. Paul grew at the practical head of [[Mississippi_River]] navigation; Minneapolis milled prairie wheat at St. Anthony Falls, the river's only major natural waterfall; Duluth ships taconite and grain from the far end of the Great Lakes; the Boundary Waters canoe country along the [[Rainy_Lake]] chain is a federally protected maze of lakes and portages. Agriculture dominates the former prairie southwest along the [[Watonwan_River]] and [[Redwood_River]]; forest products and mining dominate the northeast. For this vault, though, the state is chiefly the hub that its ~60 river articles point back to — the common terrain behind the [[List_of_longest_streams_of_Minnesota]]. **On the spine:** [[Mississippi_River]] · [[Lake_Superior]] · [[Red_River_of_the_North]] · [[Rainy_Lake]] · [[List_of_rivers_of_Minnesota]] · [[Water]]. ## Wikipedia : Wikitube **Strict pair:** [Wikipedia](https://en.wikipedia.org/wiki/Minnesota) : [Wikitube](https://en.wikitube.io/wiki/Minnesota) ## Previous hub tags Hubs: —. Portals: [[PORTAL_WT!Thury_Hydrodynamics_Compendium]]. --- *Repopulated 2026-08-12 · redlink fill · 0 deletions.*