Fall along the Merrimack is particularly lovely.
There is a huge meadow that will attract upland birds,
The volunteer steward planting bulbs that will bloom in spring at the entrance.
Extensive signage with maps helps orient the visitor.
Some of the trails are just wide grassy walks.
A great place to experience fall in New England.
Another view of the fall forest.
A mix of pine and hardwoods makes for great overhead views.
Hard to get enough fall color by the riverside.
Just a single bough of red fall leaves in the understory.
A tree stands out across the river.
If you time it right and get lucky maybe you get a sunset over the river!
And maybe with a boat.
As the sign indicates, Retelle is connected to Deer Jump Reservation.
There are a series of strong interpretive signs.
End of season goldenrod in front of fall foliage.
An arrow suggests a good way to get to the river.
This reservation runs along the Merrimack River so along with woods you can get great river views along with woods and wetlands. It was named after Al Retelle, who convinced Andover to create a Conservation Commission.
More Resources:

Town of Andover
Town page with map and information about Retelle

All Trails
Trails maps and more info.