- County: Brown
- Acres: 260
- Features: Scenic view, mature forest, woodpeckers, yellow-billed cuckoo
- Years acquired: 2011 – 2014
- Acquired with gifts from: Anonymous, the Moore family, the Nolan family, Virginia Young, Bicentennial Nature Trust, Indiana Heritage Trust, The Nature Conservancy, and Sycamore members. Trail and signage supported by the Brown County Community Foundation.
- Trails: Yellowwood Trail – 2.6 miles roundtrip, moderate; Bottomland Trail – 0.7 mile loop, easy
Trevlac Bluffs Nature Preserve
Trevlac Bluffs Nature Preserve is named for its towering 200-foot bluff over Beanblossom Creek that features a rare stand of native eastern hemlock trees, found naturally in only about two dozen places in Indiana. Hemlocks are now a more northerly species, and the stands in Indiana are remnants from the cooler early post-glacial climate of thousands of years ago. The property is dedicated as an Indiana State Nature Preserve by the Department of Natural Resources, in recognition of the statewide significance of the natural communities preserved here.
The preserve also protects over 100 acres of forested wetlands in the floodplain of Beanblossom Creek and over a mile of the creek itself, which is the main input for Lake Lemon about a mile and a half downstream. The preserve is part of a forest block that national research has identified as one of three in the Midwest that is critical for breeding migratory songbirds.
Sycamore works to control invasive plant species that threaten the health of this special forest. A major project to remove 50 acres of multiflora rose and Japanese honeysuckle in the bottomlands was completed by Habitat Solutions with funding from the Natural Resource Conservation Service. Garlic mustard and Japanese stiltgrass are targets for control by Sycamore staff and volunteers.
The bluff is crossed by a portion of the historic Yellowwood Trail, which was created in 1949 by Ken Tuxhorn of Outdoor Educational Activities. In 2019 the bottomland loop trail was re-routed and lengthened, and trail markings were improved.
- From Unionville, follow SR 45 east for 6.5 mi to Old SR 45, which is on the right just before the Beanblossom Creek bridge.
- For Yellowwood Trail, turn right onto Old SR 45 and go 0.2 mi to the marked trailhead. The gated lane past the trailhead is private.
- For the bottomland trail, continue on SR 45 for 0.7 mi, crossing the bridge.
- The trailhead is on the right by a gate, where SR 45 takes a 90-degree turn to the left.
- Parking is limited to roadside pull-offs at both locations.