Twin Bridges to Harrison is 50.7 miles and takes about 1 hour 7 minutes via MT 359, with a fuel budget near $9 and enough daylight to finish in a day. This short trip stays within Montana's Mountain West region, offering a straightforward drive. Given its brief duration, this route is ideal for a spontaneous excursion or as a segment of a larger Montana road trip. You'll find it a practical choice if you're looking for a quick connection between these two points without a significant time commitment.
Main Roads
Road
Distance
Duration
MT 359
14.6 mi
17m
Main Street
14.3 mi
21m
Mount Highway 55
9.6 mi
14m
I 90
6.8 mi
6m
Montana Highway 55
2.1 mi
3m
US 287
1.6 mi
2m
North Whitehall Street
0.5 mi
<1m
West Legion Avenue
0.4 mi
<1m
Longest stretch:
MT 359
— 14.6 mi, about 17m
Traffic on I-90
Hour-of-day weekday pattern from 8 FHWA count stations on your route.
Peak
3 PM
~402 veh/hr typical
· worst 679
Quietest
2 AM
~35 veh/hr
Peak-to-quiet ratio
11.5×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 104 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Twin Bridges, MT and Harrison, MT.
1
Start on MT 41
14 mi·21 min·Main Street
2
Turn straight onto MT 55
2.1 mi·3 min·Montana Highway 55
3
Continue on MT 55
0.3 mi·27 sec·State Highway 55
4
Turn straight onto MT 55
9.6 mi·14 min·Mount Highway 55
5
Turn right onto MT 2; MT 55
0.4 mi·41 sec·West Legion Avenue
6
Turn left onto MT 55
0.5 mi·49 sec·North Whitehall Street
7
Take the ramp
0.2 mi·24 sec
8
Merge onto I 90
6.8 mi·6 min·I 90
9
Take the exit
0.3 mi·38 sec
Toward MT 359: Cardwell, Boulder
10
Turn right onto MT 2
152 ft·3 sec·MT 2
11
Continue on MT 359
15 mi·17 min·MT 359
12
At end of road, turn right onto US 287
1.6 mi·2 min·US 287
13
Arrive at destination
US 287
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
The midpoint is around 25.4 miles from Twin Bridges, MT, which is a good place for a longer meal and fuel stop.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 7
5 decision points cluster between mile 26.3 and 49.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
3
26.3 mi into trip|~39m in|MT 2; MT 55 / West Legion Avenue
Turn right onto MT 2; MT 55 / West Legion Avenue
Navigation decision point
4
27.2 mi into trip|~40m in
Take the ramp
Navigation decision point
5
34.2 mi into trip|~47m in
Take the exit toward MT 359: Cardwell, Boulder
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward MT 359: Cardwell, Boulder
4
34.5 mi into trip|~48m in|MT 2
Turn right onto MT 2
Navigation decision point
5
49.2 mi into trip|~1h 5m in|US 287
At end of road, turn right onto US 287
Navigation decision point
Fuel & Cost
Regular Gas
$8.79 one way
$17.59 round trip
$4.41/gal25.4 MPG avg18 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$9.20
$18.39
premium
$4.95
$9.88
$19.76
diesel
$5.60
$11.18
$22.35
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$9
Estimated CO2 emission: 17.7 kg one way.
Prices: EIA weekly data, 2026-08-31.
Driving Electric?
About $5 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
15.2
0
$5.32
$2.43
Efficient EV
12.7
0
$4.44
$2.03
EV Truck/SUV
20.3
0
$7.10
$3.24
Gas CO2
18 kg
EV CO2
6 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Aug 22, 2026
Origin
Twin Bridges, MT
Afternoon
in Twin Bridges on Friday
Local time
1:01 PM
MDT
Current temp
58°F
Slight Chance Showers And Thunderstorms
NE 5 to 12 mph19% chanceLive forecast
Fire Weather Watch
Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 12:00PM MDT by NWS Missoula MT
Fire Weather Watch
Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 9:00PM MDT by NWS Missoula MT
Destination
Harrison, MT
Afternoon
in Harrison on Friday
Local time
1:01 PM
MDT
Current temp
60°F
Slight Chance Showers And Thunderstorms
NNW 2 to 7 mph20% chanceLive forecast
Fire Weather Watch
Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 12:00PM MDT by NWS Missoula MT
Fire Weather Watch
Fire Weather Watch issued August 21 at 4:30PM MDT until August 23 at 9:00PM MDT by NWS Missoula MT
78°F
Whitehall, MT
25 mi in
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
2 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
1h 7m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This route is mostly highway, with 69% of the drive on higher-speed roads. You'll encounter a longest stretch of 14.6 miles on MT 359. The transition from highway to local roads will happen as you enter the Harrison area. Expect a sense of rural cruising for much of this drive.
69% highway — fuel and pacing are the main things to plan.
13 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 14.6 mi on MT 359.
How Hard Is This Drive?
2/10
This is a straightforward highway drive that stays mostly on MT 359 and Main Street. Navigation is very simple - set it and forget it for most of the drive. The trickiest moment comes around 26.3 miles in near MT 2; MT 55 / West Legion Avenue.
Driving Effort2/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Twin Bridges, MT to Harrison, MT is easy. At 1h 7m with 69% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
The main spots that need attention: at 26.3 miles (MT 2; MT 55 / West Legion Avenue): Navigation decision point; at 27.2 miles: Navigation decision point; at 34.2 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Elevation Profile
Mostly flat terrain
4,913 ft4,276 ft
Total Climb
738 ft
Total Descent
458 ft
Highest Point
4,913 ft
~50.7 mi in
Elevation Range
637 ft
Notable High Points
4,562 ft at ~10.9 miles+13 ft prominence
4,405 ft at ~29 miles+15 ft prominence
4,766 ft at ~43.5 miles+74 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Twin Bridges, MT to Harrison, MT, road signs begin pointing toward Boulder along the way.
The longest stretch is about 14.6 miles on MT 359. The full list of main roads is in the Roads section above.
Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.
Mostly yes along the main roads, but rural stretches through MT can have sparse or no coverage. Before you leave, download offline Google Maps or Apple Maps for the route, and consider downloading music or podcasts instead of streaming. If you depend on data for navigation, keep a paper backup of the turn-by-turn directions.
The main spots that need attention: at 26.3 miles (MT 2; MT 55 / West Legion Avenue): Navigation decision point; at 27.2 miles: Navigation decision point; at 34.2 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Yes. A round trip is manageable in a single day if you plan a break at Harrison, MT before heading back.
