Illinois Natural History Survey - University of Illinois

SANGAMON RIVER 

Field of Bluebells in bloom in the Sangamon River RRA, photo by Mike Jeffords, INHS At the center of the forested corridor along the Sangamon River in this area is Allerton Park. The natural area is an example of a relatively undisturbed stream-valley ecosystem. It inlcudes bottomland forest, reclaimed prairie, and wetlands.

Map of Site
Land Cover Map of Site

SIZE: 53,734 acres; 84 square miles

LOCATION:Central Illinois; Macon and Piatt counties

The major natural features of the Sangamon River RRA are the forest tract at Robert Allerton Park and the Sangamon River. The area is highly agricultural. This RRA is relatively small. 

LANDCOVER : Nearly three-fourths of the Sangamon River RRA is cropland, the highest percentage among the RRAs. Fourteen percent of the RRA is grassland and 10% is wooded. Upland and bottomland wood percentages are moderately low. This site has the lowest acreage and lowest percentage of nonforested wetlands of the RRAs; there are only 49 acres of nonforested wetland identified in this site.

NATURAL AREAS : The two Natural Areas are Robert Allerton Park and the Sangamon River.

BIOLOGICALLY SIGNIFICANT STREAMS : A 15.5 mile stretch of the Sangamon River is designated as a BSS stream.

HERITAGE SITES : There are eight Heritage sites in this RRA representing four communities types, three animal species, and one large forest tract.

STATE AND FEDERAL LAND : No state or federal land occurs in this RRA.

NATURE PRESERVES : No Nature Preserves occur in this RRA.

NATURAL DIVISIONS : This RRA lies entirely within the Grand Prairie Natural Division.


 

SUMMARY OF SITE CHARACTERISTICS: SIZE, BIOLOGIC RESOURCES, AND PUBLIC LANDS

Total Acreage

    53,734

Natural Areas

    Acreage

880

    Number

2
Biologically Significant Stream Mileage 15.5
Natural Heritage Sites 8
State Land

    State Parks

0

    State Conservation Areas

0

    State Forests

0

    State Fish & Wildlife Areas

0

    Acreage

0

    Percentage of RRA

0.0
Federal Land

    Acreage

0

    Percentage of RRA

0.0

 


 

LANDCOVER

    Acres

    % of RRA

Upland forest 3,212.53 5.98
Bottomland forest 1,892.48 3.52
Wetland- nonforested 29.30 0.05
Grassland 7,604.83 14.15
Cropland 39,445.37 73.41
Urban/Built-up 1,213.08 2.26
Water 337.19 0.63
TOTAL 53,734.78 100.00

 


 

ILLINOIS NATURAL AREAS INVENTORY SITES

    Acres

Robert Allerton Park 719
Sangamon River 161

 


 

BIOLOGICALLY SIGNIFICANT STREAMS

    Miles

Goose Creek 0.0
Sangamon River, source to Piatt/Macon county line 15.5

 


 

NATURAL HERITAGE CATEGORIES
Communities

    Occurrences

    Types/Species

    Floodplain Forest

2 2

    Forest

2 2
Threatened and Endangered Animals

    Bird

2 2

    Reptile

1 1
Threatened and Endangered Plants
Geological Feature
Other

    Forest Block >500 Acres

1 1

 


 

STATE AND FEDERAL LAND

    Acres

State Parks 0
State Conservation Areas 0
State Forests 0
State Fish and Wildlife Areas 0
Federal Land 0

 


 

ILLINOIS NATURE PRESERVES
None

 


 

NATURAL DIVISIONS

    Acres in RRA

    % of RRA

    % of Division

Grand Prairie 53,735 100.0 0.4



Illinois Natural History Survey

1816 South Oak Street, MC 652
Champaign, IL 61820
217-333-6880
cms@inhs.illinois.edu

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