Spanning 240 miles across the South Dakota plains, this trek from Gregory to Watertown is an efficient cross-state journey that typically takes 4 hours and 56 minutes. You will spend the vast majority of your time on major routes, utilizing a combination of SD Highway 25, I-90, and SD Highway 45. Given the manageable duration, this route is perfectly suited for a single-day trip, allowing you to reach your destination without the need for an overnight stay. Expect to budget approximately $36 for fuel to complete the transit. Whether you are traveling for business or a change of scenery, the trip offers a straightforward transition between these two Great Plains communities.
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
120 miles from Gregory, SD
A natural place for your longest stop of the day
, about 2h 33m into the drive
.
Step-by-step road directions between Gregory, SD and Watertown, SD.
1
Start on East 6th Street
0.2 mi·58 sec·East 6th Street
2
At end of road, turn right onto SD 47
11 mi·18 min·Park Avenue
3
Turn right onto SD 44
16 mi·23 min·State Highway 44
4
Continue on SD 44
15 mi·22 min·SD Highway 44
5
Continue on SD 44; SD 50
0.4 mi·40 sec·West 7th Street
6
Turn left onto SD 45
0.7 mi·1 min·South Main Avenue
7
Continue on SD 45
24 mi·35 min·SD Highway 45
8
Take the ramp
0.3 mi·38 sec
9
Merge onto I 90
60 mi·56 min·I 90
10
Take the exit
0.3 mi·47 sec
Toward SD 25: Emery, Farmer
11
Turn left onto SD 25
24 mi·27 min·SD Highway 25
12
Turn right onto SD 25; SD 34
6.0 mi·7 min·SD Highway 34
13
Turn left onto SD 25
60 mi·1 hr 10 min·SD Highway 25
14
At end of road, turn right onto US 212; SD 25
3.9 mi·5 min·US Highway 212
15
Continue on US 212
1.0 mi·1 min·4th Street
16
Continue on US 212
11 mi·12 min·US Highway 212
17
Continue on US 212
6.4 mi·8 min·9th Avenue Southwest
18
Turn left onto South Broadway
0.7 mi·1 min·South Broadway
19
Arrive at destination
South Broadway
Trip Plan
To keep your energy levels high, plan for at least one dedicated stop during your 240-mile journey. Since the route is manageable in a single day, try to depart in the morning to capitalize on daylight and avoid potential fatigue during the final stretches. Keep an eye on your fuel gauge, especially when transitioning between the major highways, to ensure you stay within your $36 budget. A helpful tip for this specific route is to monitor your speed closely when moving from the interstate onto SD Highway 45 or SD Highway 25, as the change in road environment often comes with shifts in local traffic patterns. Enjoy the flexibility of a one-day trip by pacing your driving to suit your personal comfort.
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 120 miles from Gregory, SD, or about 2h 33m into the drive.
The longest continuous stretch on this route runs about 83.8 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 53 miles or 1h 22m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 120 miles or 2h 33m 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 1m
Traffic, exits, and arrival timing usually matter more near Watertown, SD than in the middle of the route.
Before You Leave
+
Open the route before leaving Gregory, SD 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 Gregory, SD
This is one driving day of about 240 miles and 4h 56m.
Your first comfortable stop window is around 53 miles from Gregory, SD.
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 SD Highway 25 for about 83.8 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 11
5 decision points cluster between mile 0.2 and 217.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.2 mi into trip|~0m in|SD 47 / Park Avenue
At end of road, turn right onto SD 47 / Park Avenue
Navigation decision point
4
10.9 mi into trip|~19m in|SD 44 / State Highway 44
Turn right onto SD 44 / State Highway 44
Navigation decision point
4
42.2 mi into trip|~1h 6m in|SD 45 / South Main Avenue
Turn left onto SD 45 / South Main Avenue
Navigation decision point
5
127.2 mi into trip|~2h 39m in
Take the exit toward SD 25: Emery, Farmer
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward SD 25: Emery, Farmer
5
217.4 mi into trip|~4h 26m in|US 212; SD 25 / US Highway 212
At end of road, turn right onto US 212; SD 25 / US Highway 212
Navigation decision point
Fuel & Cost
Regular Gas
$37.52 one way
$75.04 round trip
$3.97/gal25.4 MPG avg84 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$41.20
$82.39
premium
$4.89
$46.19
$92.37
diesel
$5.61
$52.99
$105.98
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$38
Meals
$25–$50
Total
$63–$88
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 84 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
72
0
$25.20
$11.52
Efficient EV
60
0
$21.00
$9.60
EV Truck/SUV
96
1
$33.60
$15.36
Gas CO2
84 kg
EV CO2
28 kg (67% 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 Apr 15, 2026
Origin
Gregory, SD
Evening
in Gregory on Saturday
Local time
8:06 PM
CDT
Current temp
47°F
Unavailable
Live forecast
Destination
Watertown, SD
Evening
in Watertown on Saturday
Local time
8:06 PM
CDT
Current temp
70°F
Unavailable
Live forecast
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
23 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
4h 56m 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.
More Details
What kind of drive is this?
Expect a highway-focused experience, as 91% of this route consists of high-speed travel. You will encounter varying road types, ranging from the interstate grind of I-90 to the more localized feel of the state highways. The longest uninterrupted stretch covers 83.8 miles on SD Highway 25, which demands steady focus and patience behind the wheel. As you transition between these road types, the character of the drive shifts from open, fast-paced interstate segments to the more rhythmic pace of state-maintained routes. It is a functional drive designed for steady progress rather than technical maneuvering, making it a reliable choice for those looking to cover ground efficiently.
91% highway — fuel and pacing are the main things to plan.
19 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 83.8 mi on SD Highway 25.
How Hard Is This Drive?
3/10
This is a straightforward highway drive that stays mostly on SD Highway 25 and I 90. There are only a few real navigation decisions along the way. The trickiest moment comes around 0.2 miles in near SD 47 / Park Avenue.
Driving Effort3/10
Easy - simple navigation with a manageable amount of wheel time
Balances navigation complexity with total wheel time.
This is a straightforward 4h 56m drive. You will face about 11 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
The main spots that need attention: at 0.2 miles (SD 47 / Park Avenue): Navigation decision point; at 10.9 miles (SD 44 / State Highway 44): Navigation decision point; at 42.2 miles (SD 45 / South Main Avenue): Navigation decision point.
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 Gregory, SD to Watertown, SD, road signs begin pointing toward Farmer along the way.
Farmer
127.2 mi in|~2h 39m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 4h 56m. Total distance: 240 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
The longest stretch is about 83.8 miles on SD Highway 25. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
Mostly yes along the main roads, but rural stretches through SD 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 0.2 miles (SD 47 / Park Avenue): Navigation decision point; at 10.9 miles (SD 44 / State Highway 44): Navigation decision point; at 42.2 miles (SD 45 / South Main Avenue): Navigation decision point.
Possible but tiring. At 4.9 hours each way, an in-and-out day trip would put you behind the wheel for 9.9 hours — manageable with a long break at Watertown, SD, but most travelers stay overnight.
