For most of the 20th century, Hennepin & Hopper Lakes in Putnam County, Illinois, was drained to make way for cropland. But these backwater lakes in the floodplain of the Illinois River 40 miles north of Peoria roared back to life in 2001 when the Wetlands Initiative turned off the drainage pump and began restoration.

Today the 3,000-acre Sue and Wes Dixon Waterfowl Refuge is one of the premier natural areas in the state and is open to the public 365 days a year. Where once only corn and soybeans grew, a mosaic of lakes, marshes, seeps, savannas, and prairies now supports native flora and fauna. In 2012, the Refuge was designated a Ramsar Wetland of International Importance.

Read more: Overview

Location and Visiting

The Dixon Waterfowl Refuge is located in north-central Illinois along the Illinois River, 40 miles north of Peoria and two hours southwest of the Chicago Loop. The site is open to the public every day for hiking, nature viewing, and birdwatching. The entrance, located two miles south of the village of Hennepin, is off of Route 26.

Read more: Location and Visiting


The 2019 public fishing season at Hennepin & Hopper Lakes begins May 15 and goes through Labor Day, to avoid the spring and fall migrations. A Wetlands  Initiative fishing permit is required, in addition to a State of Illinois Sport Fishing License. TWI permit applications will be available starting May 15 at the kiosk by the Refuge boat launch.

Read more: Rules and Permit Information



Before restoration, Hennepin & Hopper Lakes had been drained for nearly a century to allow farming. Before that agricultural history, these twin backwater lakes were part of a dynamic, incredibly diverse Illinois River system that supported an abundance of waterfowl. Through TWI’s efforts, the Refuge is today reclaiming that once-rich diversity of life. 

Read more: History

Ramsar Designation

On February 2, 2012, the Dixon Waterfowl Refuge was officially listed as a Wetland of International Importance, or “Ramsar Site,” in accordance with the Ramsar Convention on Wetlands. The Refuge joins only 37 other sites in the United States so far to have received the designation.

Read more: Ramsar Designation

Bioblitz Results

In August of 2018, the Wetlands Initiative held its second BioBlitz at the Dixon Waterfowl Refuge. Over the course of 24 hours, 30-plus experts led more than 75 citizen scientists in a massive search of the site, capped off by a “Biodiversity Festival” attended by participants, experts, and critters alike. Our species count is currently 915 and includes everything from fungi to birds, mammals to ants, reptiles to plants. Learn more about our species count, view bird and plant guides, and see the results of our 2015 BioBlitz.

Read more: BioBlitz Results

The Story of the Dixon Refuge

TWI co-founder Al Pyott tells the story of how he and Donald Hey first came to the Hennepin area looking for an opportunity to restore wetlands. This video was filmed at the 10th-anniversary celebration of the Dixon Waterfowl Refuge in September 2011.