Griffy Lake Nature Preserve | Bloomington

Griffy Lake Nature Preserve, located just north of Indiana University Bloomington, is a 1,220-acre protected natural area centered around a 109-acre reservoir. It is one of Bloomington’s most beloved outdoor spaces, offering a balance of ecological preservation, recreation, and environmental education. Originally established as a municipal water source in the 1920s, it has since evolved into a premier destination for hikers, paddlers, anglers, and naturalists, while continuing to serve a backup water supply function.

Historical Background

Griffy Lake was formed in the 1920s when a dam was constructed on Griffy Creek to provide a new reservoir for Bloomington’s growing population. For several decades, it served as the city's main water source. However, by the 1950s, larger reservoirs-Lake Lemon and Lake Monroe-were developed to meet increased demand, and Griffy Lake transitioned to a secondary and emergency water supply.

The surrounding land, rich with native Indiana flora and fauna, remained largely undeveloped and was preserved to protect the watershed. In the decades since, the area has been designated as a nature preserve and managed for both public use and ecological stewardship. It is co-managed by the City of Bloomington Parks & Recreation Department and the Indiana Department of Natural Resources, with adjacent parcels such as Griffy Woods owned by Indiana University and used for teaching and research.

Natural Environment and Biodiversity

Griffy Lake Nature Preserve is ecologically diverse, featuring:

Mature hardwood forests, especially oak-hickory woodlands that are characteristic of southern Indiana.

Riparian and wetland ecosystems, especially near the lake’s edges and tributary streams.

Wildflower meadows and understory habitats that support seasonal blooms and pollinators.

Wildlife is abundant and includes:

White-tailed deer, wild turkey, foxes, raccoons, and a variety of small mammals.

Over 160 bird species, both resident and migratory, making it a hotspot for birdwatchers.

Reptiles and amphibians, including frogs, turtles, and snakes.

Aquatic life such as bass, bluegill, sunfish, and catfish populating the lake.

Conservation management includes removal of invasive plant species, controlled deer population culling to reduce overgrazing, and prescribed burns to promote native plant regeneration.

Trails and Recreational Features

The preserve features over 10 miles of trails, offering varied levels of difficulty and natural experiences:

Griffy Creek Trail (1.5 miles): Runs through dense forest along a scenic tributary of the lake.

Nature Trail (0.5 mile): A short, interpretive loop ideal for beginners or families.

Lanam Trail (1 mile): Passes through upland forest with intermittent views of the lake.

Wetlands Trail: Leads hikers through low-lying, marshy terrain with boardwalk segments.

North Shore Trail: A rugged, moderate trail popular for longer hikes.

Full Lake Loop Trail (6.7 miles): Opened in recent years, this comprehensive trail loops around the entire lake and connects with other trails.

In 2022, the city completed infrastructure enhancements including:

A causeway path (0.25 miles) to allow pedestrians to safely traverse the lake's eastern shore.

An accessible fishing pier and boat launch.

Expanded parking, restrooms, picnic tables, and a boathouse area.

Boating and Fishing

Boating: Only non-motorized and electric-powered boats are allowed, helping protect the lake’s water quality. Canoes, kayaks, and paddleboards are available for rent from late spring through early fall at the Griffy Lake Boathouse. Visitors may also launch their own vessels with a daily or annual permit.

Fishing: Permitted from shore or boat year-round, including ice fishing in winter. Fish species include largemouth bass, crappie, bluegill, redear sunfish, and catfish. An Indiana fishing license is required.

Swimming: Strictly prohibited to maintain water quality due to the lake’s status as a reserve water source.

Educational and Public Programs

Griffy Lake serves not only as a recreation area but also as a living classroom:

Indiana University uses adjacent Griffy Woods (185 acres) for field research and teaching in ecology, geology, environmental science, and biology.

The City of Bloomington offers public programming such as:

Guided hikes and seasonal nature walks.

Sunset paddles and stargazing events on the lake.

Wildlife workshops, leaf-peeping in fall, and winter ecology activities.

Interpretive signage along trails for self-guided learning.

These programs aim to deepen community engagement and encourage environmental stewardship.

Visitor Information

Hours: Open daily from 5:00 AM to 11:00 PM.

Admission: Free of charge; no entrance fee.

Facilities: Vault toilets (seasonal), picnic tables, boathouse (spring–fall), watercraft rental services, and ADA-accessible features.

Rules: No camping, no ground fires, dogs must be leashed, and visitors must follow Leave No Trace principles.

Summary

Griffy Lake Nature Preserve is a richly biodiverse, peaceful retreat just minutes from downtown Bloomington and Indiana University. Its forested hills, clear waters, and winding trails provide an accessible space for outdoor recreation, scientific study, and quiet connection with nature. Through careful ecological management and community-focused programming, the preserve continues to thrive as a model of urban-wildland balance, serving both environmental and public interests.