Longest continuous mileage on one Interstate

[pderocco]

If we're talking about multiple trip clinches, I've done I-80, which is about 2900 miles.

[dlsterner]

My intent of longest continuous mileage was the most mileage between two points along one highway. It does not necessarily have to be from one trip, can be from several trips that can combine for the continuous mileage. Also exiting the highway and getting back on at the same exit doesn't break it either.

Since Dough4872 is the OP, I will use their definition of "continuous".  Mileage values are approximated.

I-90     995 miles    Tomah, WI -- Billings, MT     (one trip, but some segments were out of order, and some side trips off the route, so kind of iffy)
I-95     970 miles    Daytona Beach, FL -- NJ Turnpike  (combining multiple trips)
I-81     859 miles    entire route  (combining multiple trips)

Longest in a single trip
I-85     677 miles   entire route  (one trip)  Only exits were for food, fuel, lodging.

[Hunty2022]

Here are two different lists from two different perspectives:

List one - single trip mileage:
1. I-26 (286 miles) WB from I-95 to I-81. Only exits were for state welcome centers and to eat.
2. I-81 (240 miles) NB from I-26 to I-64 multiplex end. Only exits were the VA Welcome Center and one gas stop.
3. I-95 (195 miles) SB from VA-288 to NC-53/210. Only exit was the NC Welcome Center.

List two - multiple trips adding up:
1. I-81 (296 miles) from I-40 to I-64 multiplex end.
2. I-64 (226 miles) from I-81 multiplex begin to I-264 (VA).
3. I-85 (155 miles) from I-73 to I-26.

Bold is top 3 most continuous mileage all time.

[kphoger]

My intent of longest continuous mileage was the most mileage between two points along one highway. It does not necessarily have to be from one trip, can be from several trips that can combine for the continuous mileage. Also exiting the highway and getting back on at the same exit doesn't break it either.

In that case...

I-35.  If you count both iterations of I-35W to be part of I-35, then I've got 1480 miles between Laredo TX and Hinckley MN.  If you don't count the I-35W stretches, then it comes to 1352 miles.

I-70.  Never mind.  I think I'm actually missing the bump in Kansas City.  If it weren't for that tiny bit, I'd have 1432 miles between Sevier UT and Effingham IL.  But I don't.

[boilerup25]

My intent of longest continuous mileage was the most mileage between two points along one highway. It does not necessarily have to be from one trip, can be from several trips that can combine for the continuous mileage. Also exiting the highway and getting back on at the same exit doesn't break it either.

By this updated definition:
I-5 from San Diego, CA to Elk Grove, CA (489 mi)
I-65 from the I-90 in Gary, IN to I-165 south of Bowling Green, KY (379 miles)
I-66 in its entirety (76.38 mi)
I-70 from Breezewood, PA to St. Louis, MO (699 miles)
I-76 [east] from the I-80 junction in Ohio to its end in NJ (378 miles)
I-80 from the I-90 junction in Indiana to the I-76 junction in Ohio (353 miles)
I-81 from I-40 in TN to I-66 in VA (376 mi)
I-84 [west] from Jerome, ID to Portland, OR (546 mi)
I-87 [New York / north] in its entirety (333 mi)
I-90 from Madison, WI to I-80 split in Ohio (451 mi)
I-95 from the I-4/FL 400 junction to the I-95/I-295/I-276 junction (959 miles, per 2018 mileage update) [Lifetime Record]

[MATraveler128]

I-90 from I-271 in Ohio all the way to Boston at the eastern end a total of 611 miles.

[vdeane]

The top ones I can think of:
-I-95 (south end in Miami to US 201 near Fairfield, ME): 1,723 miles
-I-90 (I-55 to east end in Boston): 982 miles
-I-81 (entire route): 854 miles

[kphoger]

Looking at non-Interstate continuous mileage...

US-277:  420 miles between Del Rio TX and Randlett OK (on one trip).

US-50:  I might have had 514 miles between Delta CO and Dodge City KS.  But I think I'm missing the bit in Pueblo that's bypassed by CO-47.  So that's probably a no-go.

[JayhawkCO]

Looking at non-Interstate continuous mileage...

US-277:  420 miles between Del Rio TX and Randlett OK (on one trip).

US-50:  I might have had 514 miles between Delta CO and Dodge City KS.  But I think I'm missing the bit in Pueblo that's bypassed by CO-47.  So that's probably a no-go.

My longest two US routes:
US30: 1,581 miles from Portland, OR to Grand Island, NE
US36: 958 miles from Rocky Mountain National Park to Decatur, IL

Bonus Canadian route:
TCH16: 984 miles from Jasper, AB to Portage la Prairie, MB

[1995hoo]

Mine is I-95, but I'm not sure of the exact mileage because my records for I-95 in Massachusetts represent a best guess. The last time I was on any portion of I-95 in Massachusetts other than the very small portion between the northern end of I-495 and the New Hampshire state line was August of 1981, so I'm not positive exactly where we went and my Travel Mapping log is a guess (that, as I look at it today, strikes me as almost certainly incorrect—but the only other person who might know would be my father and he is no longer with us). So if I count from the southern end of I-95 in Miami to the Rhode Island/Massachusetts state line, I get 1,502.23 miles, and then there is some amount more than that in Massachusetts to the south of Boston and I just don't know how much.

I remember we stayed at the old Harvard Motor Lodge when we visited Boston on that trip and rode the subway from the old Harvard/Brattle subway station, so I ought to look at an old map and see if I can piece together what my father would likely have considered the most logical route.

[flan]

For me it's pretty easily I-94 between ND 25 west of Mandan and IN 249 in Portage. ~893 miles.

[DTComposer]

Clinched over multiple trips:
I-5 - entire length, 1381 miles
I-15 - I-5 in San Diego to I-90 near Butte, ~1157 miles
I-80 - US-101 in San Francisco to US-40/189 near Silver Summit, UT, ~759 miles

Clinched in one trip:
I-5 - I-710 in Commerce, CA to I-405 in Portland, ~970 miles
I-15 - CA-91 in Riverside to I-90 near Butte, ~1,070 miles (done in one drive with stops for gas)
I-80 - I-680 near Fairfield, CA to US-40/189 near Silver Summit, UT, ~714 miles

[epzik8]

All 2,172 miles of I-70.

[freebrickproductions]

That would be about 1,526 miles along I-90 from Seattle, WA, to Sioux Falls, SD, for me then.

[DandyDan]

I have driven on all 753 miles of I-80 between US 183 neat Elm Creek, NE and the Business US 31 exit at Roseland, IN. However, if you count the miles I rode in a car as a kid, I possibly have many more on I-90. I have definitely driven between I-65 in Gary, IN and I-29 in Sioux Falls, but AFAIK, I could have all of it to Bozeman, MT.

[TheHighwayMan3561]

Probably I-35 from Burnsville, MN to Laredo, TX in October 2015 (1400 miles, following I-35E in Texas as I consider that the successor to I-35). I already had everything north of the Denton split clinched before that though.

[kphoger]

I-35.  If you count both iterations of I-35W to be part of I-35, then I've got 1480 miles between Laredo TX and Hinckley MN.  If you don't count the I-35W stretches, then it comes to 1352 miles.

Probably I-35 from Burnsville, MN to Laredo, TX in October 2015 (1400 miles, following I-35E in Texas as I consider that the successor to I-35). I already had everything north of the Denton split clinched before that though.

For what it's worth, I have not clinched I-35E through Dallas, nor do I think I've clinched I-35E through Saint Paul.  But I've clinched both I-35Ws.

[roadman65]

I did in July 21, I-5 from I-505 in CA to I-205 near Portland. Don't know how many miles, but I've done it.

I've mentioned before that I've done I-70 from KC to Vandalia, IL, which may not count as it's probably less than 300 miles and not fit into the criteria per OP.

[kphoger]

I've mentioned before that I've done I-70 from KC to Vandalia, IL, which may not count as it's probably less than 300 miles and not fit into the criteria per OP.

What criteria would that not fit?

[boilerup25]

Here's my records:

782 miles on I-95 from the I-4/FL 400 interchange in Florida to the I-95/I-395/I-495 interchange in Springfield, VA.
699 miles on I-70 from Breezewood, PA to St. Louis, MO.

By clarifications of definitions later and with new mileage added, here is what I have:

1183 miles on I-95 from the I-4/FL 400 interchange in Florida to the RI 102 interchange near West Greenwich, RI.
699 miles on I-70 from Breezewood, PA to St. Louis, MO.

[boilerup25]

Here's my current record:
699 miles on I-70 from Breezewood, PA to St. Louis, MO.

[Hot Rod Hootenanny]

1500 miles along I-40 from its western terminus in California to somewhere in Arkansas.
Distant second for me would be I-75 at 1,090 miles from Atlanta to the Canadian border.