Geography
[edit]
A 2020 Sentinel-2 true-color image of the Indianapolis metropolitan area
Indianapolis is located in the East North Central region of the Midwestern United States, about fourteen miles (23 km) south-southeast of Indiana's geographic center. It is situated 98 miles (158 km) northwest of Cincinnati, Ohio; 107 miles (172 km) north of Louisville, Kentucky; 164 miles (264 km) southeast of Chicago, Illinois; 168 miles (270 km) west of Columbus, Ohio; and 243 miles (391 km) northeast of St. Louis, Missouri. According to the U.S. Census Bureau, the Indianapolis (balance) encompasses a total area of 367.9 square miles (953 km2), of which 361.6 square miles (937 km2) is land and 6.3 square miles (16 km2) is water. It is the 18th-most extensive city by land area in the U.S.
As a consolidated city-county, Indianapolis's city limits are coterminous with Marion County, except the autonomous and semi-autonomous municipalities outlined in Unigov. Nine civil townships form the broadest geographic divisions within the city and county; these are Center, Decatur, Franklin, Lawrence, Perry, Pike, Warren, Washington, and Wayne townships. The consolidated city-county borders the adjacent counties of Boone to the northwest; Hamilton to the north; Hancock to the east; Shelby to the southeast; Johnson to the south; Morgan to the southwest; and Hendricks to the west.
Between 2.6 million and 11,700 years ago, the Indianapolis area was situated on the southern margin of the Laurentide ice sheet. The erosive advance and retreat of glacial ice produced a flat or gently sloping landscape, known as a till plain. Elevations across Indianapolis vary from about 650 feet (198 m) to 900 feet (274 m) above mean sea level. Indianapolis is located in the West Fork White River drainage basin, part of the larger Mississippi River watershed via the Wabash and Ohio rivers. The White River flows 31 miles (50 km) north-to-south through the city and is fed by some 35 streams, including Eagle Creek, Fall Creek, Pleasant Run, and Pogue's Run. The city's largest waterbodies are artificial quarry lakes and reservoirs.
Cityscape[edit]
Downtown Indianapolis skyline viewed from the southwest, 2019
Indianapolis is an example of a planned city. In 1821, the Indiana General Assembly selected a site near the confluence of the White River and Fall Creek to serve as the new state capital, adopting a plan co-designed by surveyors Alexander Ralston and Elias Pym Fordham. The grid plan called for a town of 1 square mile (2.6 km2) centered on a traffic circle (from which Indianapolis's "Circle City" nickname originates). Four diagonal avenues—Indiana (northwest), Kentucky (southwest), Massachusetts (northeast), and Virginia (southeast)—radiated a block from the circle. The city's address numbering system originates at the intersection of Washington (running east–west) and Meridian streets (running north–south).
In the 2020 census, Indianapolis was among the 20 largest cities in the U.S. by both population and land area. The city’s population density of 2,455 people per square mile (948/km2) ranked 222nd among major U.S. cities. This contrast is evident in Indianapolis's cityscape where low-density development patterns dominate and some 14,600 acres (5,900 ha) of farmland remain within its municipal boundaries.
Neighborhoods[edit]
See also: List of neighborhoods in Indianapolis
Single-family homes in the Irvington Terrace Historic District
For statistical purposes, the consolidated city-county is organized into 99 "neighborhood areas" with most containing numerous individual historic and cultural districts, subdivisions, and some semi-autonomous towns. In total, some 500 self-identified neighborhood associations are listed in the city's Registered Community Organization system. As a result of the city's expansive land area, Indianapolis has a unique urban-to-rural transect, ranging from dense urban neighborhoods to suburban tract housing subdivisions, to rural villages.
Typical of American cities in the Midwest, Indianapolis urbanized in the late 19th and early 20th centuries, resulting in the development of relatively dense, well-defined neighborhoods clustered around streetcar corridors, especially in Center Township. Notable streetcar suburbs include Broad Ripple, Irvington, and University Heights. Starting in the mid-20th century, the post–World War II economic expansion and subsequent suburbanization greatly influenced the city's development patterns. From 1950 to 1970, nearly 100,000 housing units were built in Marion County, most outside Center Township in suburban neighborhoods such as Castleton, Eagledale, and Nora.
Since the 2000s, downtown Indianapolis and surrounding neighborhoods have seen increased reinvestment mirroring nationwide market trends, driven by empty nesters and millennials. Renewed interest in urban living has been met with some dispute regarding gentrification and affordable housing. According to a Center for Community Progress report, neighborhoods like Cottage Home and Fall Creek Place have experienced measurable gentrification since 2000. The North Meridian Street Historic District is among the most affluent urban neighborhoods in the U.S., with a mean household income of $102,599 in 2017.
Historic districts and landmarks[edit]
See also: List of tallest buildings in Indianapolis
Segment of the former Indiana Central Canal, an American Water Landmark
The 8-mile-long (13 km) Indiana Central Canal is the oldest extant artificial facility in the city, dating to the 1830s. Between 1985 and 2001, nearly 1.5 miles (2.4 km) of the former canal in downtown Indianapolis were redeveloped into a cultural and recreational amenity. North of 18th Street, the canal retains much of its original appearance, flowing through the north side neighborhoods of Riverside, Butler–Tarkington, Rocky Ripple, and Broad Ripple. This segment has been recognized as an American Water Landmark since 1971.
More than 260 properties and historic districts are listed on the National Register of Historic Places in Marion County; most sites are located in Center Township, listed separately. This includes nine National Historic Landmarks: the Athenæum (Das Deutsche Haus), the Benjamin Harrison House, the Broad Ripple Park Carousel, Hinkle Fieldhouse, the Indiana World War Memorial, the Indianapolis Motor Speedway, the James Whitcomb Riley House, the Madam C. J. Walker Building, and Oldfields–Lilly House & Gardens.
The Indianapolis Historic Preservation Commission oversees 13 local historic districts and five conservation areas. Notable districts include Chatham–Arch and Massachusetts Avenue, Cottage Home, Cumberland, Fletcher Place, Fountain Square, Herron–Morton Place, Irvington, Lockefield Gardens, Lockerbie Square, Monument Circle, New Augusta, the Old Northside, Ransom Place, St. Joseph, the Wholesale District, and Woodruff Place.
The Soldiers' and Sailors' Monument (completed 1902) stands in contrast to Salesforce Tower (completed 1990), reflecting different periods in the development of Indianapolis’s skyline.
Following the dedication of the 284-foot (87 m) Soldiers' and Sailors' Monument in 1902, Indianapolis enacted its first height restriction laws to protect views of the monument.[citation needed] In 1962, the 372-foot (113 m) City-County Building became the first high-rise in the city to surpass the monument’s height.[citation needed] The tallest residential buildings in Indianapolis, the twin 295-foot (90 m) 30-floor Riley Towers, were completed in 1963. The 48-floor Salesforce Tower, completed in 1990, is the city’s tallest, with a roof height of 701 feet (214 m). Its distinctive twin antenna masts bring the building’s height to 811 feet (247 m).
Indiana limestone has been a signature building material in Indianapolis since the 1800s, featured prominently in the city’s monuments, churches, commercial, and civic buildings. Examples include Roberts Park Methodist Episcopal Church (1876), the Indiana Statehouse (1888), the Majestic Building (1896), the Soldiers' and Sailors' Monument (1902), Birch Bayh Federal Building and United States Courthouse (1905), Saints Peter and Paul Cathedral (1907), the Indianapolis Masonic Temple (1909), Old Indianapolis City Hall (1910), Central Library (1917), the Scottish Rite Cathedral (1927), Circle Tower (1929), the Indiana World War Memorial (1933), the Indiana State Library and Historical Bureau (1934), Clowes Memorial Hall (1963), and OneAmerica Tower (1982).
Parks[edit]
See also: List of parks in Indianapolis
Eagle Creek Park is the largest and most visited park in Indianapolis.
The city of Indianapolis maintains 212 public parks, totaling 11,258 acres (4,556 ha) or about 5.1% of the city's land area. Garfield Park, the city's first municipal park, opened in 1876 as Southern Park. George Kessler's Indianapolis Park and Boulevard Plan (1909) linked notable parks, such as Brookside, Ellenberger, Garfield, and Riverside, with a system of parkways following the city's waterways. The system's 3,474 acres (1,406 ha) were added to the National Register of Historic Places in 2003. Eagle Creek Park, Indianapolis's largest and most visited park, ranks among the largest municipal parks in the U.S., covering 4,766 acres (1,929 ha).
Marion County is also home to parks managed by the State of Indiana, including Fort Harrison State Park and White River State Park. Established in 1996, Fort Harrison State Park covers 1,744 acres (706 ha) that are overseen by the Indiana Department of Natural Resources. Since 1979, White River has been owned and operated by the White River State Park Development Commission, a quasi-governmental agency. White River's 250 acres (100 ha) are home to several attractions, including the Indianapolis Zoo and White River Gardens. Two land trusts are active in the city managing several sites for nature conservation throughout the region.
Flora and fauna[edit]
A white-tailed deer among deciduous trees in Indianapolis
Indianapolis is situated in the Southern Great Lakes forests ecoregion which in turn is located within the larger temperate broadleaf and mixed forests biome, as defined by the World Wide Fund for Nature. Based on the U.S. Environmental Protection Agency's alternative classification system, the city is located in the Eastern Corn Belt Plains, an area of the country known for its fertile soil.
Much of the deciduous forests that once covered 98% of the region were cleared for agriculture and urban development, contributing to considerable habitat loss. Indianapolis's current urban tree canopy averages approximately 33%. A rare example of old-growth forest in the city can be found on 15 acres (6.1 ha) of Crown Hill Cemetery's North Woods in the Butler–Tarkington neighborhood. The cemetery's 555 acres (225 ha) represents the largest green space in Center Township, home to an abundance of wildlife and some 130 species of trees. Native trees most common to the area include varieties of ash, maple, and oak. Several invasive species are also common in Indianapolis, including tree of heaven, wintercreeper, Amur honeysuckle, and Callery pear.
A 2016 bioblitz along three of the city's riparian corridors found 590 taxa. Urban wildlife common to the Indianapolis area include mammals such as the white-tailed deer, eastern chipmunk, eastern cottontail, and the eastern grey and American red squirrels. In recent years, local raccoon and groundhog populations have increased alongside sightings of American badgers, beavers, mink, coyotes, and red fox. Birds native to the area include the northern cardinal, wood thrush, eastern screech owl, mourning dove, pileated and red-bellied woodpeckers, and wild turkey. Located in the Mississippi Flyway, the city sees more than 400 migratory bird species throughout the year. Some 57 species of fish can be found in the city's waterways, including bass and sunfish. Some federally-designated endangered and threatened species are native to the Indianapolis area, including several species of freshwater mussels, the rusty patched bumble bee, Indiana bat, northern long-eared bat, and the running buffalo clover.
In recent years, the National Wildlife Federation has ranked Indianapolis among the ten most wildlife-friendly cities in the U.S.
Climate[edit]
Fall foliage and a late-winter snowfall on the Butler University campus
Indianapolis has a hot-summer humid continental climate (Köppen climate classification: Dfa), but can be considered a borderline humid subtropical climate (Köppen: Cfa) using the 27 °F (−3 °C) isotherm. It experiences four distinct seasons. The city lies at the transition between USDA plant hardiness zones 6a and 6b.
Typically, summers are fairly hot, humid, and wet. Winters are generally cold with moderate snowfall. The July daily average temperature is 75.4 °F (24.1 °C). High temperatures reach or exceed 90 °F (32 °C) an average of 18 days each year, and occasionally exceed 95 °F (35 °C). Spring and autumn are usually pleasant, if at times unpredictable. Midday temperature drops exceeding 30 °F or 17 °C are common during March and April, and instances of very warm days (80 °F or 27 °C) followed within 36 hours by snowfall are not unusual during these months. Winters are cold, with an average January temperature of 28.1 °F (−2.2 °C). Temperatures dip to 0 °F (−18 °C) or below an average of 3.7 nights per year.
The rainiest months occur in the spring and summer, with slightly higher averages during May, June, and July. May is typically the wettest, with an average of 5.05 inches (12.8 cm) of rain. Most rain is derived from thunderstorm activity. There is no distinct dry season, although occasional droughts occur. Severe weather is not uncommon, particularly in the spring and summer months. Indianapolis experiences an average of 20 thunderstorm days annually.
Indianapolis's average annual rainfall is 42.4 inches (108 cm). Snowfall averages 25.9 inches (66 cm) per season. Official temperature extremes range from 106 °F (41 °C), set on July 14, 1936, to −27 °F (−33 °C), set on January 19, 1994.
Climate data for Indianapolis (Indianapolis International Airport), 1991–2020 normals, extremes 1871–present
Month
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Year
Record high °F (°C)
71(22)
77(25)
88(31)
90(32)
96(36)
104(40)
106(41)
103(39)
100(38)
92(33)
81(27)
74(23)
106(41)
Mean maximum °F (°C)
58.8(14.9)
64.4(18.0)
74.0(23.3)
80.8(27.1)
87.1(30.6)
91.9(33.3)
93.4(34.1)
92.6(33.7)
90.7(32.6)
82.8(28.2)
70.5(21.4)
61.7(16.5)
94.9(34.9)
Mean daily maximum °F (°C)
36.1(2.3)
40.8(4.9)
51.9(11.1)
63.9(17.7)
73.4(23.0)
82.0(27.8)
85.2(29.6)
84.3(29.1)
78.2(25.7)
65.6(18.7)
51.8(11.0)
40.4(4.7)
62.8(17.1)
Daily mean °F (°C)
28.5(−1.9)
32.5(0.3)
42.4(5.8)
53.6(12.0)
63.6(17.6)
72.5(22.5)
75.8(24.3)
74.7(23.7)
67.8(19.9)
55.5(13.1)
43.3(6.3)
33.3(0.7)
53.6(12.0)
Mean daily minimum °F (°C)
20.9(−6.2)
24.2(−4.3)
33.0(0.6)
43.3(6.3)
53.7(12.1)
62.9(17.2)
66.4(19.1)
65.0(18.3)
57.4(14.1)
45.5(7.5)
34.9(1.6)
26.2(−3.2)
44.4(6.9)
Mean minimum °F (°C)
−2.1(−18.9)
4.8(−15.1)
14.9(−9.5)
27.2(−2.7)
37.8(3.2)
49.2(9.6)
56.1(13.4)
55.1(12.8)
43.1(6.2)
30.2(−1.0)
19.6(−6.9)
6.8(−14.0)
−4.9(−20.5)
Record low °F (°C)
−27(−33)
−21(−29)
−7(−22)
18(−8)
27(−3)
37(3)
46(8)
41(5)
30(−1)
20(−7)
−5(−21)
−23(−31)
−27(−33)
Average precipitation inches (mm)
3.12(79)
2.43(62)
3.69(94)
4.34(110)
4.75(121)
4.95(126)
4.42(112)
3.20(81)
3.14(80)
3.22(82)
3.45(88)
2.92(74)
43.63(1,108)
Average snowfall inches (cm)
8.8(22)
6.0(15)
3.2(8.1)
0.2(0.51)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.1(0.25)
0.8(2.0)
6.4(16)
25.5(65)
Average extreme snow depth inches (cm)
5.0(13)
3.6(9.1)
2.3(5.8)
0.1(0.25)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.0(0.0)
0.3(0.76)
3.4(8.6)
7.3(19)
Average precipitation days (≥ 0.01 in)
12.3
10.3
11.5
11.9
13.3
11.5
10.3
8.3
7.9
8.9
10.2
11.8
128.2
Average snowy days (≥ 0.1 in)
7.0
5.8
2.4
0.3
0.0
0.0
0.0
0.0
0.0
0.1
1.2
5.6
22.4
Average relative humidity (%)
75.0
73.6
69.9
65.6
67.1
68.4
72.8
75.4
74.4
71.6
75.5
78.0
72.3
Average dew point °F (°C)
18.1(−7.7)
21.6(−5.8)
30.9(−0.6)
39.7(4.3)
50.5(10.3)
59.9(15.5)
64.9(18.3)
63.7(17.6)
56.7(13.7)
44.1(6.7)
34.9(1.6)
24.4(−4.2)
42.4(5.8)
Mean monthly sunshine hours
132.1
145.7
178.3
214.8
264.7
287.2
295.2
273.7
232.6
196.6
117.1
102.4
2,440.4
Percentage possible sunshine
44
49
48
54
59
64
65
64
62
57
39
35
55
Average ultraviolet index
2
3
4
6
8
9
9
8
6
4
2
2
5
Source 1: NOAA (relative humidity, dew point, and sun 1961–1990
Source 2: Weather Atlas (UV)