Thunderbird Lake 1 Dam

Low HazardNot Available ConditionEmergency Action Plan: No

Location

StateIllinois
CountyMcHenry
Nearest CityBARREVILLE-OFFSTREAM
River/StreamSLEEPY HOLLOW CREEK
Coordinates42.27641, -88.26982

Physical Characteristics

Dam TypeEarth
NID Height7 ft
Dam Height7 ft
Dam Length420 ft
Year Completed1965 (61 years old)

Storage & Hydraulics

NID Storage395 acre-ft
Max Storage395 acre-ft
Normal Storage220 acre-ft
Spillway TypeUncontrolled

Ownership & Safety

PurposeRecreation
OwnerCHARLES F. WIRTH
Owner TypePrivate
Hazard ClassificationLow
Condition AssessmentNot Available
Last Inspection10/03/2025
Emergency Action PlanNo

Identifiers

NID IDIL01125
Federal IDIL01125
More InfoState Dam Safety Program

Nearby Dams

Thunderbird Lake 2 Dam 0.1 mi Low Black Tern Marsh Dam 2.4 mi Low Silver Lake Dam 2.4 mi Low Stratton Lock And Dam 2.5 mi Significant Yellow Head Marsh Dam 3.0 mi Low Island Lake Dam 3.5 mi Low Slocum Lake Dam 4.2 mi Low Lakeland Estates Dam 5.8 mi Low Wold Lake Dam 6.3 mi Low Woodscreek Detention Dam 6.5 mi Low