Indiana Dunes National Park is a national park of the United States located in northwestern Indiana managed by the National Park Service. It was authorized by Congress in 1966 as the Indiana Dunes National Lakeshore and was redesignated as the nation's 61st national park on February 15, 2019. The park runs for about 20 miles (32 km) along the southern shore of Lake Michigan and covers 15,349 acres (6,212 ha). Along the lakefront, the eastern area is roughly the lake shore south to U.S. 12 or U.S. 20 between Michigan City, Indiana, on the east and the Cleveland-Cliffs steel plant on the west. This area's conservation scheme is enhanced by the older Indiana Dunes State Park. To the west of the steel plant lies West Beach and a small extension south of the steel mill continues west along Salt Creek to Indiana 249. The western area is roughly the shoreline south to U.S. 12 between the Burns Ditch west to Broadway in downtown Gary, Indiana. In addition, there are several outlying areas, including Pinhook Bog, in LaPorte County to the east; the Heron Rookery in Porter County, the center of the park; and the Hoosier Prairie State Nature Preserve and the Hobart Prairie Grove, both in Lake County, the western end of the park.
The Kankakee River is a tributary of the Illinois River, approximately 133 miles (214 km) long, in the Central Corn Belt Plains of northwestern Indiana and northeastern Illinois in the United States. At one time, the river drained one of the largest wetlands in North America and furnished a significant portage between the Great Lakes and the Mississippi River. Significantly altered from its original channel, it flows through a primarily rural farming region of reclaimed cropland, south of Lake Michigan.
Northwest Indiana, nicknamed The Region after the Calumet Region, is an unofficial region of northern Indiana, United States that is located at the northwestern corner of the state. Though there is no official definition of the region, it is based on the Gary, Indiana Metropolitan Division, which comprises Jasper, Lake, Porter and Newton counties in Indiana, and the Michigan City-La Porte, IN Metropolitan Statistic Area, which comprises LaPorte, with unofficial definitions also including Starke and Pulaski counties. This region neighbors Lake Michigan and parts of it are in the Chicago metropolitan area. According to the 2020 Census, the largest definition of Northwest Indiana has a population of 866,965 and is the state's second largest urban area after the Indianapolis Metropolitan Area. It is also the home of the Indiana Dunes, parts of which have been preserved through conservation efforts. The town of Ogden Dunes houses the Hour Glass, a museum showcasing the ecological and conservation efforts of O. D. Frank.
Lake Chicago was a prehistoric proglacial lake that is the ancestor of what is now known as Lake Michigan, one of North America's five Great Lakes. Formed about 13,000 years ago and fed by retreating glaciers, it drained southwest through the Chicago Outlet River.
Lake Maumee was a proglacial lake and an ancestor of present-day Lake Erie. It formed about 17,500 calendar years, or 14,000 Radiocarbon Years Before Present (RCYBP) as the Huron-Erie Lobe of the Laurentide Ice Sheet retreated at the end of the Wisconsin glaciation. As water levels continued to rise the lake evolved into Lake Arkona and then Lake Whittlesey.
The glacial history of Minnesota is most defined since the onset of the last glacial period, which ended some 10,000 years ago. Within the last million years, most of the Midwestern United States and much of Canada were covered at one time or another with an ice sheet. This continental glacier had a profound effect on the surface features of the area over which it moved. Vast quantities of rock and soil were scraped from the glacial centers to its margins by slowly moving ice and redeposited as drift or till. Much of this drift was dumped into old preglacial river valleys, while some of it was heaped into belts of hills at the margin of the glacier. The chief result of glaciation has been the modification of the preglacial topography by the deposition of drift over the countryside. However, continental glaciers possess great power of erosion and may actually modify the preglacial land surface by scouring and abrading rather than by the deposition of the drift.
The Tinley Moraine is a moraine around the Lake Michigan basin in North America. It was formed during the Wisconsin Glaciation and is younger than the higher and wider terminal moraine called the Valparaiso Moraine, which is located farther from the lake than the Tinley Moraine. Compared to the Valparaiso Moraine, the Tinley Moraine is much narrower and occupies a similar swath, about 6 miles (10 km) closer to Lake Michigan, and passes through the communities of Flossmoor, Western Springs, and Arlington Heights. The moraine was named after the village of Tinley Park, a village southwest of Chicago that lies on the moraine.
The Kankakee Outwash Plain is a flat plain interspersed with sand dunes in the Kankakee River valley in northwestern Indiana and northeastern Illinois of the United States. It is just south of the Valparaiso Moraine and was formed during the Wisconsin Glaciation. As the glacier stopped at the Valparaiso Moraine, its meltwater was carried away to the outwash plain. On the south side of the moraine, where the elevation drops, the meltwaters eroded away valleys, carrying sand and mud with them. As the muddy meltwater reached the valley where the slope lessened, the water slowed, depositing the sand on the outwash plain. This created a smooth, flat, and sandy plain. Before its draining, the Kankakee Marsh, located on the outwash plain, was one of the largest freshwater marshes in the United States.
The Calumet Shoreline is an ancient shoreline of Lake Michigan located in the Lake Michigan Basin. It can be clearly seen as a sand ridge along Ridge Road south of Chicago. Closer to the lake from the Calumet Shoreline, there are the Tolleston shorelines and farther from the lake are the Glenwood Shoreline, the Tinley Moraine, and the Valparaiso Moraine. The shoreline is named after the Calumet Region of Northern Indiana.
The Glenwood Shoreline is an ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It is named after the town of Glenwood, Illinois. The shoreline was formed when the lake was higher during the last ice age, while ice blocked the Straits of Mackinac. After the straits were freed, the lake receded and left behind a sand ridge at an elevation of about 640 feet (200 m) where the shore resided. This ridge can be seen clearly in Glenwood, Illinois, Dyer, Indiana, and Schererville, Indiana, all south of Chicago.
The Kankakee Torrent was a catastrophic flood that occurred about 19,000 calibrated years ago in the Midwestern United States. It resulted from a breach of moraines forming a large glacial lake fed by the melting of the Late Wisconsin Laurentide Ice Sheet. The point of origin of the flood was Lake Chicago. The landscape south of Chicago still shows the effects of the torrent, particularly at Kankakee River State Park and on the Illinois River at Starved Rock State Park.
The Mississinawa Moraine begins in Ohio east of Lima in Hardin County, then running in a shallow arc to the south of Grand Lake St. Marys and St. Marys in Mercer County towards Fort Recovery, Ohio. Just west of Fort Recovery, the moraine again arches southward towards the Mississinewa River. The moraine follows the eastern bank of the river northwestward to where it enters the Wabash River at Wabash, Indiana. Angling towards the north and a little east, the Mississinawa moraine merges with the Packerton Moraine north of the Eel River in Whitley County near Columbia City. The moraine does not end here, but continues in a northeasterly direction through the three corners area of Michigan, Indiana, and Ohio until reaching Ann Arbor, Michigan where numerous moraines intermingle. Note: There are two common spellings of the name. Mississinawa is commonly used in the older reports. Mississinewa is the modern usage and the spelling used on modern maps and projects associated with the river. Both spellings are used interchangeably in this article, based on the source material.
The Fort Wayne Moraine is considered contemporary to the last stages of the Valparaiso Moraine. Centered on Fort Wayne, Indiana, the northern leg of the moraine is mostly overlaid by the younger Wabash Moraine angling northeastward through Williams County, Ohio. It only becomes identifiable in Lenawee County, Michigan south and northeast of Adrian before ending in the intermingling of moraines around Ann Arbor. The south and eastern leg of the moraine follows the northern bank of the St. Marys River into the State of Ohio. At the north bend of the St. Marys River, the moraine arcs northeastward through Lima, continuing in a northward arc to reach north of U.S. 30 in Hancock County to pass through Upper Sandusky, again bending to the north to end 15 miles (24 km) to 20 miles (32 km) to the northeast.
The Toleston Shoreline is the third ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It takes its name from the village of Tolleston, now a portion of Gary, Indiana. The shoreline formed when Lake Chicago was high enough to drain through the Chicago outlet into the Des Plaines River. The beach is 18 to 25 feet above the level of Lake Michigan. The Indiana segment and the Illinois segment, north to Evanston are still visible. North of Evanston and Michigan City, Indiana, the beach has been eroded by later ice movement or shoreline wave action.
Lake Kankakee formed 14,000 years before present (YBP) in the valley of the Kankakee River. It developed from the outwash of the Michigan Lobe, Saginaw Lobe, and the Huron-Erie Lobe of the Wisconsin glaciation. These three ice sheets formed a basin across Northwestern Indiana. It was a time when the glaciers were receding, but had stopped for a thousand years in these locations. The lake drained about 13,000 YBP, until reaching the level of the Momence Ledge. The outcropping of limestone created an artificial base level, holding water throughout the upper basin, creating the Grand Kankakee Marsh.
The Marseilles moraine is a terminal moraine that encircles the southern tip of Lake Michigan in North America. It begins near Elgin, Illinois, and extends south and west of Chicago metropolitan area, turning eastward 30 miles (48 km) to 40 miles (64 km) south of the lake in Kankakee and Iroqouis counties, entering Indiana. It formed during the Wisconsin glaciation. The glacier had been in retreat when it stopped for an extended period, depositing glacial till and sand creating the hills of the moraine.
Lake Whittlesey was a proglacial lake that was an ancestor of present-day Lake Erie. It formed about 14,000 years ago. As the Erie Lobe of the Wisconsin Glacier retreated at the end of the last ice age, it left melt-water in a previously-existing depression area that was the valley of an eastward-flowing river known as the Erigan River that probably emptied into the Atlantic Ocean following the route of today's Saint Lawrence River. The lake stood at 735 feet (224 m) to 740 feet (230 m) above sea level. The remanent beach is not horizontal as there is a ‘hinge line’ southwest of a line from Ashtabula, Ohio, through the middle part of Lake St. Clair. The hinge line is where the horizontal beaches of the lake have been warped upwards towards the north by the isostatic rebound as the weight of the ice sheet was removed from the land. The rise is 60 feet (18 m) north into Michigan and the Ubly outlet. The current altitude of the outlet is 800 feet (240 m) above sea level. Where the outlet entered the Second Lake Saginaw at Cass City the elevation is 740 feet (230 m) above sea level. The Lake Whittlesey beach called the Belmore Beach and is a gravel ridge 10 feet (3.0 m) to 15 feet (4.6 m) high and one-eighth mile wide. Lake Whittlesey was maintained at the level of the Ubly outlet only until the ice melted back on the "Thumb" far enough to open a lower outlet. This ice recession went far enough to allow the lake to drop about 20 feet (6.1 m) below the lowest of the Arkona beaches to Lake Warren levels.
The Lake Border Moraine is a complex group of moraines bordering the southern end of Lake Michigan. It can be traced north along the eastern shore of the lake basin and across the highlands between the northern Lake Michigan and Saginaw Bay. It continues around the Saginaw Basin into the "thumb" of Michigan, and south through southeastern Michigan on the eastern side of the "thumb." Along Lake Michigan, north to Holland the system is close to the shore. From Holland north to Oceana County it is 15 miles (24 km) to 25 miles (40 km) east of the shore. In Oceana County it forms the prominent "clay banks" along the shoreline of Lake Michigan. It again bears inland from Hart, where more recent moraines reside between it and Lake Michigan. It runs north of the great interlobate moraine that exists between the Lake Michigan and Saginaw lobes of the Laurentian ice sheet. A little north of Cadillac turns to the east. A short distance from Cadillac, it splits with the southern ridge or outer member heading to the Saginaw basin. The northern ridge heads towards Lake Huron, but turns south before reaching the shore. In Newaygo and Lake counties it rest on an earlier interlobate moraine. It separates in Wexford and Missaukee counties to continue south along the west side of the Saginaw basin.
The Packerton Moraine in north-central Indiana has been considered by most persons who have studied it to be a large interlobate moraine between the Saginaw and the Erie lobes. The northeast-southwest direction of the eskers north of Disko, Wabash County, and the southeast-northwest trend south of there indicated that the part of the Packerton moraine south of Disko was built by the Erie lobe and the part north of Disko by the Saginaw lobe. An esker, Miami County shows a northeast-southwest alignment, providing evidence that Packerton moraine in Miami County was built by the Erie lobe. A small area in the northwestern was deposited by the Saginaw lobe. It is named the Packerton moraine from the village of Packerton in Kosciusko County. Thirteen kames and eskers complexes are mixed with sand and gravel. The till is, sandier, especially in the part deposited by the Saginaw lobe, than in the lobe passed over some source of sand, whereas the Erie lobe did not. Water-laid or wind-blown sands are found throughout the moraine. The bulk of the sand seems to have been water-deposited, but locally the sand appears to have been reworked by the wind. Few of the sand deposits exhibit dunal forms.
The Calumet Aquifer is an aquifer underlying the land at the extreme southern tip of Lake Michigan. It underlies the northern third of Lake County, Indiana, and the northern tenth of Porter County, as well as small parts of LaPorte County and Cook County, Illinois. It is notable chiefly for its high levels of contamination by industrial waste from factories and toxic waste dumps in the Calumet Region. It is bordered to the south by Valparaiso Moraine Aquifer, and to the north by Lake Michigan. It is underlain by a Silurian bedrock aquifer complex.
