Coulee Dam, WA to Tacoma, WA is 244 miles and takes about 5 hours 2 minutes via I 90 and State Route 18, with a fuel budget near $51 and enough daylight to finish in a day. This highway-focused drive will take you from the Pacific Coast region to the Pacific Coast region, entirely within Washington state. It's a straightforward trip that's perfect for a single day of driving, offering a practical way to get from point A to point B without many detours. Consider this if you're looking for an efficient journey with minimal fuss.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
122 miles from Coulee Dam, WA
A natural place for your longest stop of the day
, about 2h 38m into the drive
.
Main Roads
Road
Distance
Duration
I 90
125.7 mi
2h 17m
State Route 18
26.7 mi
34m
Coulee Boulevard
25.1 mi
32m
Coulee Corridor
23 mi
32m
Basin Street Southwest
19.9 mi
26m
I 5
7.2 mi
9m
Coulee Corridor / Sunset Highway
4.3 mi
6m
WA 28
3.7 mi
5m
Longest stretch:
I 90
— 125.7 mi, about 2h 17m
Traffic on I-90
Hour-of-day weekday pattern from 35 FHWA count stations on your route.
Peak
1 PM
~1,207 veh/hr typical
· worst 2,108
Quietest
2 AM
~99 veh/hr
Peak-to-quiet ratio
12.2×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 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 Coulee Dam, WA and Tacoma, WA.
1
Start on Marina Way
93 ft·4 sec·Marina Way
2
Continue on Roosevelt Way
0.1 mi·20 sec·Roosevelt Way
3
Continue on WA 155
0.2 mi·27 sec·State Highway 155
4
Turn left onto WA 155
0.2 mi·33 sec·Columbia Avenue
5
Continue on WA 155
0.2 mi·26 sec·State Route 155
6
Continue on WA 155
1.7 mi·3 min·Coulee Corridor
7
Continue on WA 155
0.5 mi·1 min·Midway Avenue
8
Continue on WA 155
257 ft·7 sec·Midway Avenue
9
Continue on WA 155
0.5 mi·56 sec·Grand Coulee Avenue
10
Continue on WA 155
25 mi·32 min·Coulee Boulevard
11
Continue on US 2
4.3 mi·6 min·Coulee Corridor / Sunset Highway
12
Turn left onto WA 17
21 mi·29 min·Coulee Corridor
13
Turn right onto WA 28
3.7 mi·5 min·WA 28
14
Turn left onto Alder Street Northwest
1.6 mi·2 min·Alder Street Northwest
15
Continue on Alder Street Southwest
0.4 mi·56 sec·Alder Street Southwest
16
Turn right onto 5th Avenue Southwest
392 ft·16 sec·5th Avenue Southwest
17
Turn left onto WA 28
20 mi·26 min·Basin Street Southwest
18
Take the ramp
0.3 mi·44 sec
Toward I 90 West: Seattle
19
Merge onto I 90
126 mi·2 hr 17 min·I 90
Use the straight / slight right lanes.
20
Take the exit
0.2 mi·30 sec
Exit 25Toward WA 18 West: AuburnUse the slight right lane.
21
Keep slight left at fork
448 ft·13 sec
Toward SR 18 west, Snoqualmie Parkway: Auburn, TacomaUse the straight / left / right lanes.
22
Merge onto WA 18
0.3 mi·25 sec·Snoqualmie Parkway
23
Continue on WA 18
27 mi·34 min·State Route 18
Use the straight / slight right lanes.
24
Take the exit
0.6 mi·1 min
Toward I 5: Seattle, TacomaUse the straight / slight right lanes.
25
Keep slight left at fork
0.6 mi·1 min
Toward I 5 South, WA 161: Enchanted Parkway South, TacomaUse the straight lane.
26
Keep slight left at fork
0.2 mi·31 sec
Toward I 5 South: Tacoma
27
Merge onto I 5
7.2 mi·9 min·I 5
Use the straight / slight right lanes.
28
Take the exit
0.1 mi·19 sec
Exit 133Toward WA 7 South, I 705 North: City Center, Tacoma Dome
29
Keep slight right at fork
334 ft·8 sec
Toward I 705 North: City Center, Tacoma Dome Station
30
Keep slight left at fork
0.4 mi·50 sec
Toward I 705 North: City CenterUse the straight / slight right lanes.
31
Merge onto I 705
0.3 mi·22 sec·I 705
Use the straight / slight right lanes.
32
Take the exit
0.3 mi·37 sec
Toward A Street, City CenterUse the slight left lane.
33
Keep slight left at fork
0.2 mi·31 sec
Toward South 15 Street, Pacific AvenueUse the slight left / straight lanes.
34
Continue on South 15th Street
0.3 mi·59 sec·South 15th Street
Use the straight / left / right lanes.
35
Turn right onto Tacoma Avenue South
0.3 mi·49 sec·Tacoma Avenue South
36
Turn right onto South 11th Street
43 ft·1 sec·South 11th Street
37
Arrive at destination
South 11th Street
Trip Plan
With a duration of just over 5 hours, this trip is easily manageable in a single day. Aim to depart Coulee Dam in the morning to maximize daylight and allow for a relaxed arrival in Tacoma. You'll want to plan for one stop, perhaps around the halfway point, to refuel and stretch your legs. Given the longest stretch is over 125 miles, ensure your fuel tank is adequately filled before embarking on the I 90 segment. Keep an eye on traffic as you approach the Tacoma area, as congestion can sometimes impact travel times.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 122 miles from Coulee Dam, WA, or about 2h 38m into the drive.
The longest continuous stretch on this route runs about 125.7 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 54 miles or 1h 15m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 122 miles or 2h 38m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 3m
Traffic, exits, and arrival timing usually matter more near Tacoma, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Coulee Dam, WA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Coulee Dam, WA
This is one driving day of about 244 miles and 5h 2m.
Your first comfortable stop window is around 54 miles from Coulee Dam, WA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 90 for about 125.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 24
5 decision points cluster between mile 206.1 and 243.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
206.1 mi into trip|~4h 10m in
Take the exit toward WA 18 West: Auburn
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 25
Toward WA 18 West: Auburn
9
206.3 mi into trip|~4h 10m in
Keep slight left at fork toward SR 18 west, Snoqualmie Parkway: Auburn, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / left / right lanes.
Toward SR 18 west, Snoqualmie Parkway: Auburn,...
8
234 mi into trip|~4h 46m in
Keep slight left at fork toward I 5 South, WA 161: Enchanted Parkway South, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight lane.
Toward I 5 South, WA 161: Enchanted Parkway Sou...
8
243 mi into trip|~4h 59m in
Take the exit toward A Street, City Center
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward A Street, City Center
9
243.2 mi into trip|~4h 59m in
Keep slight left at fork toward South 15 Street, Pacific Avenue
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / straight lanes.
Toward South 15 Street, Pacific Avenue
Fuel & Cost
Regular Gas
$47.53 one way
$95.06 round trip
$4.95/gal25.4 MPG avg85 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.18
$49.80
$99.60
premium
$5.39
$51.79
$103.58
diesel
$4.80
$46.07
$92.14
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$48
Meals
$25–$50
Total
$73–$98
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 85.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $26 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
73.2
0
$25.62
$11.71
Efficient EV
61
0
$21.35
$9.76
EV Truck/SUV
97.6
1
$34.16
$15.62
Gas CO2
85 kg
EV CO2
29 kg (66% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 Jul 18, 2026
Origin
Coulee Dam, WA
Late night
in Coulee Dam on Sunday
Local time
3:26 AM
PDT
Current temp
92°F
Unavailable
Live forecast
Destination
Tacoma, WA
Late night
in Tacoma on Sunday
Local time
3:26 AM
PDT
Current temp
53°F
Mostly Cloudy
SW 2 mph0% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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
39 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 2m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Klondike Gold Rush - Seattle Unit National Historical Park
National Historical Park
Seattle flourished during and after the Klondike Gold Rush. Merchants supplied people from around the world passing through this port city on their way to a remarkable adventure in the Yukon Territory...
19 mi from route
~49 min detour
Free
near mile 218.8
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This is primarily a highway-focused drive, with 67% of the route utilizing major highways like I 90. You'll experience a significant stretch of 125.7 miles on I 90, meaning extended periods of consistent speed and road conditions. While Coulee Boulevard and State Route 18 will offer some variation, the majority of your time will be spent on well-maintained, high-speed roads. Expect a driving experience that prioritizes efficiency over winding scenic byways.
67% highway — fuel and pacing are the main things to plan.
37 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 125.7 mi on I 90.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on I 90 and State Route 18. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 206.1 miles in.
Driving Effort10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 24 significant decision points across 244 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 206.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 206.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 234 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Hilly terrain with moderate elevation changes
2,539 ft250 ft
Total Climb
3,013 ft
Total Descent
3,912 ft
Highest Point
2,539 ft
~174.3 mi in
Elevation Range
2,290 ft
Notable High Points
2,307 ft at ~104.6 miles+821 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 Coulee Dam, WA to Tacoma, WA, road signs begin pointing toward Snoqualmie Parkway: Auburn along the way.
Tacoma, a major port on the Puget Sound, is the third-largest city in Washington State, with about 220,000 residents. It has a dynamic art scene and a great ballet.
Top landmarks
•Tacoma Narrows Bridge — suspension bridge that collapsed in 1940
•Browns Point Light — lighthouse in Washington, United States
•Fort Nisqually — an important fur trading and farming post of the Hudson's Bay Company
Doable as a same-day drive at 5h 2m. Total distance: 244 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 2m drive, comfortable solo distance.
Frequently Asked Questions
The longest stretch is about 125.7 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 12 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Tacoma, WA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 12 rest areas along the route for bathroom stops.
The main spots that need attention: at 206.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 206.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 234 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Klondike Gold Rush - Seattle Unit National Historical Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.0 hours each way, a round trip means 10.1 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Tacoma, WA before the return drive.
