Control-Structure Ratings on the Fox River at McHenry and Algonquin, Illinois

Scientific Investigations Report 2009-5186
Prepared in cooperation with the Illinois Department of Natural Resources?Office of Water Resources
By: , and 



The Illinois Department of Natural Resources-Office of Water Resources operates control structures on a reach of the Fox River in northeastern Illinois between McHenry and Algonquin. The structures maintain water levels in the river for flood-control and recreational purposes. This report documents flow ratings for hinged-crest gates, a broad-crested weir, sluice gates, and an ogee spillway on the control structures at McHenry and Algonquin. The ratings were determined by measuring headwater and tailwater stage along with streamflow at a wide range of flows at different gate openings. Standard control-structure rating techniques were used to rate each control structure. The control structures at McHenry consist of a 221-feet(ft)-long broad-crested weir, a 4-ft-wide fish ladder, a 50-ft-wide hinged-crest gate, five 13.75-ft-wide sluice gates, and a navigational lock. Sixty measurements were used to rate the McHenry structures. The control structures at Algonquin consist of a 242-ft-long ogee spillway and a 50-ft-wide hinged-crest gate. Forty-one measurements were used to rate the Algonquin control structures.

Study Area

Publication type Report
Publication Subtype USGS Numbered Series
Title Control-Structure Ratings on the Fox River at McHenry and Algonquin, Illinois
Series title Scientific Investigations Report
Series number 2009-5186
DOI 10.3133/sir20095186
Edition -
Year Published 2009
Language ENGLISH
Publisher U.S. Geological Survey
Contributing office(s) Illinois Water Science Center
Description vii, 61 p.
Projection Albers Equal-Area Conic Projection
Scale 1
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details