Union River - Trophy Fly Fishing Near Acadia National Park

Tucked away in Hancock County, the Union River is one of Downeast Maine’s overlooked fisheries. The river flows approximately 50 miles from the lakes and ponds of eastern Maine to Union River Bay in Ellsworth, transitioning from cold inland waters to a broad tidal estuary and creating a diverse watershed rich in both natural history and angling opportunities. While it may not have the name recognition of Grand Lake Stream, the Union River remains an intriguing destination for anglers who appreciate wild landscapes and fisheries with deep conservation significance. Less than an hour drive from Bar Harbor and Acadia National Park, it offers vacationing anglers a wilder reprieve from the park crowds.

Historically, the Union River was an important migratory corridor for Atlantic salmon, alewives, American eels, and other sea-run species. During the 19th and early 20th centuries, logging operations and hydropower development dramatically altered the river. Several dams were constructed throughout the watershed, limiting fish passage and changing natural flow patterns. The construction of Ellsworth Dam and the creation of Graham Lake significantly reshaped the system, flooding extensive wetlands and forests that once bordered the river.

Despite these changes, the watershed still supports a variety of fish species. Anglers desiring a challenge and the chase of promise can find brook trout in colder tributaries and headwater streams, while the lower river and associated lakes contain landlocked salmon, smallmouth bass, white perch, and chain pickerel. Our guiding efforts focus on the high return warm water sections of the river where 4 to 5 lb smallmouth are not uncommon.

During spring and fall, float trips provide opportunities for personal best smallmouth fishing, while summer offers enjoyable and refreshing wet wade fishing in the many plunge pools and runs in the upper systems.

Conservation efforts are helping shape the future of the Union River fishery. The Green Lake National Fish Hatchery, established in 1973, has long played an important role in Atlantic salmon restoration efforts throughout Maine. Future fish passage improvements on the Union River could eventually allow the watershed to once again support returning salmon populations. Additionally, ongoing dam relicensing discussions have increased attention on water quality, habitat connectivity, and migratory fish restoration throughout the watershed. Organizations such as Trout Unlimited continue advocating for reconnecting fragmented coldwater habitats and protecting native fisheries from development pressures and climate impacts.

For anglers seeking a quieter corner of Downeast Maine, a day trip escape from Acadian crowds, and easy float trips with steady action, the Union River offers a compelling blend of history, conservation, and opportunity. It may not be Maine's most famous fly-fishing destination, but its recovering ecosystem and diverse watershed make it a fascinating place to explore and a river worth watching as restoration efforts continue.