Hop Brook Lake
Middlebury, Connecticut · on Hop Brook
Verified · 4 independent sources · top-verified
- WATER
- reservoir
- ACCESS
- Designated swim area
- FEE
- Yes, see below
- SEASON
- Best in summer
About Hop Brook Lake
Hop Brook Lake is a 21-acre recreation pool within a 536-acre US Army Corps of Engineers flood-control reservoir spanning Middlebury, Naugatuck, and Waterbury, Connecticut. The Corps operates an official day-use park at this swimming hole with a designated swim beach, picnic areas, ball field, and miles of hiking and biking trails, making it a well-equipped place to swim. The dam was built 1965-1968 for flood control on Hop Brook.
The site sits along Hop Brook in the rolling wooded hill country of western New Haven County, where the Corps of Engineers dammed the brook to create a flood-control reservoir with a smaller designated recreation pool. The developed day-use area includes paved parking, picnic shelters, athletic fields, and trailheads for over seven miles of hiking and mountain-biking trail that circle the lake (recreation.gov).
Swimming at Hop Brook Lake
Swimming takes place at an official, at times lifeguarded, sand beach and designated swimming area on the reservoir's recreation pool (max depth about 18 feet per Wikipedia's citation of the Corps' own project description). Water clarity is described as variable, and the beach is subject to periodic closures when bacteria or algae levels rise after heavy rain, so it suits casual lake swimming and families more than open-water distance swimmers (recreation.gov; newenglandswimmingholes.com; USACE news release).
How to get to this swimming hole
From I-84 West take Exit 17, turn left onto Route 63, then turn left at the 4th traffic light into the park entrance. From I-84 East take Exit 17, turn right and travel south through 2 traffic lights; the entrance is on the left (recreation.gov).
Parking: Paved day-use parking lot at the recreation area (newenglandswimmingholes.com).
The hike in
- To the water
- ~0.2 mi one-way
- Time on foot
- 5-10 minutes
Difficulty: easy to moderate (rated 2/5 by newenglandswimmingholes.com), mixed-surface path
Trailhead: Paved day-use parking lot at the Hop Brook Lake Recreation Area (accessed from Route 63 off I-84 Exit 17).
This is a short access walk from the day-use lot to the shoreline/beach, not a hike on the park's separate 7+ mile network of hiking/biking trails that circle the lake; no source names a specific 'beach trail' -- it appears to be an unnamed paved/mixed-surface walkway.
The park's 7+ miles of hiking/mountain-biking trails (per recreation.gov) circle the wider lake and are a separate recreational feature from the short beach-access walk; no source describes them as leading to a swimming spot.
Plan your visit
Bringing kids
OK with supervision
Designated, at-times-lifeguarded sand beach with a swim area on a reservoir is generally family-friendly, but exact water depth/shallow-entry slope at the beach is not published, current-season lifeguard staffing is not confirmed, and the beach has been closed for bacteria/algae after heavy rain, so families should check posted advisories on arrival (recreation.gov; USACE news release; newenglandswimmingholes.com).
Parking
Lot
Paved day-use parking lot (newenglandswimmingholes.com). Fee status conflicts between sources: recreation.gov and campxplore state day-use entry fees are no longer charged, while newenglandswimmingholes.com describes a 'gate fee in summer' and advises confirming the beach is open before paying -- this could not be resolved and is left null rather than guessed.
Restrooms
Yes
Recreation area has restroom facilities with flush toilets, sinks, and water fountains, per recreation.gov and campxplore; exact location relative to the beach (e.g., at the parking lot vs. beach itself) is not specified by either source.
Water clarity
Varies with season and flow
Recreation.gov-linked sources and regional swimmers describe clarity as variable, with a documented 2024 closure due to elevated bacteria and an algal bloom following heavy rain and runoff. No visitor-forum corroboration specific to Hop Brook Lake in Middlebury could be located.
Hours
Recreation area hours are 8 a.m. to 8 p.m. per the USACE news release; the rest of the park stays open even when the swim beach itself is closed for water-quality reasons.
On the water
Restrictions: No gas-powered motorboats; only electric trolling motors permitted. Paddleboards are not mentioned by any source (neither confirmed nor prohibited) and no-wake/carry-in specifics beyond 'electric motors only' are not published.
A boat launch exists on-site for canoe/kayak/rowboat/sailboard use per the prior dossier's facilities list; recreation.gov and campxplore both describe paddling as a favorite lake activity.
Backstory
The earthfill dam (520 ft long, 97 ft high) was built by the US Army Corps of Engineers for flood control between December 1965 and December 1968 at a cost of $6.2 million, requiring relocation of 1.8 miles of Route 63. It can store up to 2.23 billion gallons of floodwater in addition to the 21-acre permanent recreation pool (Wikipedia, citing archived USACE project materials).
Hop Brook Lake: FAQ
Does Hop Brook Lake charge a fee?
Recreation.gov and campxplore state user fees are no longer charged for day-use entry; however, one first-hand source (newenglandswimmingholes.com) describes a gate fee during summer months and advises confirming the swim beach is open before paying, so fee status may vary by season or may be outdated on one of these sources.
Is Hop Brook Lake kid friendly?
Designated, at-times-lifeguarded sand beach with a swim area on a reservoir is generally family-friendly, but exact water depth/shallow-entry slope at the beach is not published, current-season lifeguard staffing is not confirmed, and the beach has been closed for bacteria/algae after heavy rain, so families should check posted advisories on arrival (recreation.gov; USACE news release; newenglandswimmingholes.com).
How hard is the hike to Hop Brook Lake?
A hike is required, about ~0.2 mi one-way to the water (5-10 minutes). Wear real shoes, since approaches to natural swim spots are often rocky or rooty.
Where do I park for Hop Brook Lake?
Paved day-use parking lot (newenglandswimmingholes.com). Fee status conflicts between sources: recreation.gov and campxplore state day-use entry fees are no longer charged, while newenglandswimmingholes.com describes a 'gate fee in summer' and advises confirming the beach is open before paying -- this could not be resolved and is left null rather than guessed.
Can I bring a kayak or paddleboard to Hop Brook Lake?
A boat launch exists on-site for canoe/kayak/rowboat/sailboard use per the prior dossier's facilities list; recreation.gov and campxplore both describe paddling as a favorite lake activity.
When is the best time to visit Hop Brook Lake?
Summer, when the swim beach is staffed/open for lifeguarded swimming; the broader park (fishing, trails) is used spring through fall (newenglandswimmingholes.com; recreation.gov).
What are the rules at Hop Brook Lake?
Day-use only, no overnight camping in the day-use area (a separate campground exists 0.7 mi away per Recreation.gov). No motorized boats on the lake, only electric trolling motors. Pets are prohibited on the beach and must be leashed elsewhere in the park. No ATVs, dirt bikes, generators, or drones. Vehicles may not drive through interior gates. Recreation area hours are 8 a.m. to 8 p.m. (recreation.gov; USACE news release).
What water body is Hop Brook Lake on?
Hop Brook Lake is on Hop Brook, a natural reservoir verified in USGS hydrography data.
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