Massacre Rocks W Rest Area Westbound – I-86
On I-86 westbound near Heglar in Power County, Idaho, Massacre Rocks W Rest Area offers a place to stop. Reported truck parking: 20 spaces.
Location map
Marker shows recorded coordinates, not an entrance or approved driving route. Follow highway signs.
Open directionsReported parking capacity
Reported capacity from the 2019 federal truck parking survey (FHWA Jason's Law). This is not real-time vacancy information.
Facilities and amenities
Unknown (not documented in the sources): Family restroom, Accessible facilities, Drinking water, Picnic tables, Pet area, Vending machines, Public phone, RV dump station.
A reported facility does not guarantee current availability.
About this rest area
Drivers heading west on I-86 near Heglar, Idaho, can take a break at the Massacre Rocks W Rest Area. Its current operating status has not been verified. Conditions can change, so confirm with the Idaho Department of Transportation before you rely on this stop.
Location and driving direction
The rest area sits on the westbound side of I-86 near Heglar in Power County. The recorded position is around mile marker 31.
Parking and amenities
Truck parking: 20 reported spaces (the 2019 federal truck parking survey (FHWA Jason's Law)).
Facilities reported for this location:
- Restrooms
These are capacity figures, not a live count of free spaces. Individual facilities can be closed temporarily.
How long can you stay?
Idaho allows up to 10 consecutive hours at interstate rest areas and 16 hours at rest areas on other state highways. Camping is prohibited. Always follow the limit posted on site. Source: IDAPA 39.03.50 (checked November 2026).
Map and coordinates
Recorded coordinates: 42.697221, -112.958528. Use them as a reference only; follow the posted signs to the entrance.
Frequently asked questions
Is this rest area on I-86 Westbound?
Yes. The federal truck parking inventory record identifies it as the westbound facility on Interstate 86 near Heglar.
How many truck spaces are there?
The 2019 federal truck parking survey (FHWA Jason's Law) lists 20 truck parking spaces at this facility. This does not indicate how many are currently free.
Are there restrooms?
Yes, restrooms are included in the official amenities listing. Check current conditions before travel.
Can I stay overnight at this rest area?
Idaho allows up to 10 consecutive hours at interstate rest areas and 16 hours at rest areas on other state highways. Camping is prohibited. Posted signs on site apply.