WI . . .
North: The junction of threes and fives (I-535, US-53, WI-35) in Superior is sort of a half interchange. Northernmost full interchange is US-2, US-53, and WI-13 southeast of Superior.
East: WI-42/57 and Green Bay Road in Sturgeon Bay is a half interchange. Easternmost full interchange is I-43, US-151, and WI-42 in Manitowoc.
South: US-61, US-151, WI-11, and WI-35 near Dubuque.
West: I-94, US-12, and WI-35 in Hudson.
Central: I-39, US-51, and WI-153 in Mosinee.
MN:
East: I-90/US 14/US 61 (Exit 276) east split at La Crescent
South: I-35/Freeborn County 5 (Exit 2) south of Albert Lea
North and West: US 2 half-interchange with River Rd/4th St in East Grand Forks
Central: the MN 371/Business MN 371 interchange south of Baxter/Brainerd
PA:
North: I-90/US 20 (Exit 45) near North East
East: I-84/US 209 (Exit 53) in Matamoras
South: I-81/PA 163 (Exit 1) along the Mason/Dixon Line (interchange partially in MD); I-79 Exit 1 near Mount Morris is furthest south wholly within PA
West: I-70 Exit 1, West Alexander
Central: I-99/PA 150 (Exit 78) near Bellefonte
Freeway-to-freeway:
North: I-86/I-90 near North East
East: US 1/US 13 near Morrisville
South: I-95/US 322 in Chester
West: I-80/I-376/PA 760 near Sharon
Central: I-99/US 322 just north of Penn State University (the I-80/I-99 interchange will be very close to challenging this when built) *I'm not counting it, but the I-99/PA 26 interchange could work here too if regarded as a very short Super-2 and not as very long ramps.
CT:
North: I-84 at CT 171, Union (narrowly beats out I-91 and I-395)
East: US 6 at ST 695, Killingly (beats I-95 at CT 216 by 0.002 degree)
South and West: I-95 exit 2, Delevan Ave, Greenwich
Center: CT 9, exit 21, at CT 372, Berlin
For tiebreakers, using Google Maps lat/long display when clicking the intersection of the centerlines of both routes
For Utah
North: I-15 exit 398 - 25800 North/Portage (this barely edges out the I-84 Snowville interchanges)
South: SR 7 exit 3 - River Rd (just about right on the Arizona line)
East: I-70 exit 227 - Westwater
West: I-80 exit 1 - Aria Blvd/Wendover
Central: I-15 exit 207 - SR 78/Levan
Four of those are standard diamond interchanges. The Wendover one is a half-diamond that would be partly in Nevada if the other two ramps were built.
MA:
North: I-95 exit 90 MA 286
South: MA 28 Brick Kilm Road exit
East: MA 6 exit 89 MA 6A (technically the route 6 rotory)
West: I-90 exit 3 MA 41
NY:
Northern: I-87 Exit 43 (US 9 South at the Canadian Border)
Southern: NY 440 Exit 1 (on Staten Island)
Eastern: NY 27 Exit 66 (just before the east end of the freeway portion)
Western: I-86/NY 17 Exit 4 (NY 426) in Findley Lake
Central (Pratt's Hollow) Thruway Exit 33 (NY 365) in Verona
Central for MA is I-190 Exit 9 (MA 140 in Boyleston, Rutland being the center point).
Georgia
Central: I-16 exit 18, Bullard Rd/ Jeffersonville (About a mile from the geographic center as determined by the US Geological Survey)
South: I-75 exit 2, Bellville Rd/ Lake Park
East: Harry Truman Pkwy exit serving US 80 on the east side of Savannah
West: I-59 exit 4, Deer Head Cove Rd/ Rising Fawn
North: I-24 exit 169, SR 299/ Wildwood
New Hampshire
South - US 3/Spit Brook Rd (Exit 1)
East - I-95/Market St (Exit 7)
North - I-93/NH 18/135 (Exit 44)
West - I-89/NH 12A (Exit 20)
Vermont
South - I-91/US 5 (Exit 1)
East - I-93/VT 18 (Exit 1)
North - I-91/Caswell Ave (Exit 29)
West - VT 279/VT 7A
Maine
South/West - I-95/ME 103 (Exit 1)
East - I-95/US 2 (Exit 305)
North - I-95/US 2 (Exit 291)
Virginia
Southern - US-29 / US-58 in Danville
Northern - I-81 / SR-669 (Exit 323)
Western - US-23 / US-58 Alt / SR-884 in Big Stone Gap
Eastern - I-264 / Birdneck Rd (Exit 22) in Virginia Beach
Quote from: jp the roadgeek on May 30, 2021, 01:54:54 AM
NY:
Northern: I-87 Exit 43 (US 9 South at the Canadian Border)
Southern: NY 440 Exit 1 (on Staten Island)
Eastern: NY 27 Exit 66 (just before the east end of the freeway portion)
Western: I-86/NY 17 Exit 4 (NY 426) in Findley Lake
Central (Pratt's Hollow) Thruway Exit 33 (NY 365) in Verona
Central for MA is I-190 Exit 9 (MA 140 in Boyleston, Rutland being the center point).
I think I-90/Shortman Road is barely further west.
Quote from: SectorZ on May 30, 2021, 11:57:15 AM
Vermont
South - I-91/US 5 (Exit 1)
East - I-93/VT 18 (Exit 1)
North - I-91/Caswell Ave (Exit 29)
West - VT 279/VT 7A
Further west than US 4/VT 22A?
WA:
North: I-5 and SR 548/D St. Blaine, WA
South: I-205 and SR 14 in Vancouver, WA
East: I-90 and Spokane Bridge Rd., at Spokane Bridge, WA
West: Slipramps with overpass - US 101 and State St. Aberdeen, WA - Full Diamond or better, US 101 and River Rd., Sequim, WA
Central: SR 28 and SR 285 in East Wenatchee, WA (with a Fred Meyer in the middle of the Interchange)
Indiana:
N: I-80/90 (Indiana Toll Road) at SR 9 in Howe
S: I-69/Veterans Parkway at US 41 in Evansville
E: I-70 at US 40 in Richmond
W: I-64 at SR 69 in Griffin
Central: Not 100% sure
Louisiana:
North: I-49 at LA 168 near Ida (exit 245)
South: US 90 at LA 662 near Gibson (exit 185)
East: I-59 exit 11 Pearl River Turnaround
West: I-20 at LA 168 in Greenwood (exit 3)
Central: I-49 at LA 115 near Bunkie (exit 53)
iPhone
Quote from: sprjus4 on May 30, 2021, 12:22:08 PM
Virginia
Southern - US-29 / US-58 in Danville
Northern - I-81 / SR-669 (Exit 323)
Western - US-23 / US-58 Alt / SR-884 in Big Stone Gap
Eastern - I-264 / Birdneck Rd (Exit 22) in Virginia Beach
Depending on definition of interchange, the US 13-13 Bus set-up south of the Tasley roundabout may qualify as the easternmost Virginia interchange.
For South Carolina:
East - US 17 @ SC 9 EAST Little River
South - I-95 @ US 17 Hardeeville
West - SC 11 @ SC 28 near Walhalla
North - I-26 @ SC 14 Landrum
Ohio
North: I-90 and OH 7. Thought it would be OH 11 and 21st St in Ashtabula, but the latitude says otherwise (41.915 vs 41.889)
South: US 52 and OH 7 (31.423). US 52 and Solida Rd (31.424) is a close second place.
East: US 62 and OH 82 (-80.529)
West: I-74 and New Haven Rd (-84.799)
Central: I-71 and OH 61 (8.5 miles from Memorial Park in Centerburg)
Quote from: vdeane on May 30, 2021, 12:24:35 PM
Quote from: SectorZ on May 30, 2021, 11:57:15 AM
Vermont
South - I-91/US 5 (Exit 1)
East - I-93/VT 18 (Exit 1)
North - I-91/Caswell Ave (Exit 29)
West - VT 279/VT 7A
Further west than US 4/VT 22A?
Val is correct...US 4/VT 22A.
Also, I-89/US 7/Exit 22 has I-91 slightly beat for northernmost.
Given the geographical center of Vermont, the centralmost would be I-89/VT 64/Exit 5.
Quote from: Mapmikey on May 30, 2021, 04:56:46 PM
Depending on definition of interchange, the US 13-13 Bus set-up south of the Tasley roundabout may qualify as the easternmost Virginia interchange.
Yeah, I saw that and thought of it but interpreted it as more of a quadrant intersection than full interchange, though I suppose you could look at it that way.
The I-264 is the eastern most true interchange.
Centermost for SC is I-77 exit 6, SC 768, in Columbia
MO:
West: Atchison County Routes A/B and I-29 (Exit 116)
North: I-35 and US 69 (Exit 114). Only 3 of the 4 ramps are in Missouri.
East: US 60/62 on I-55 (Exit 12)
South: Pemiscot County O on I-55 (Exit 5)
Center (position based on coordinates provided by this (https://www.thoughtco.com/geographic-centers-of-the-united-states-1435168) website: US 50 and MO 87 in California
Quote from: sprjus4 on May 30, 2021, 12:22:08 PM
Virginia
Southern - US-29 / US-58 in Danville
Northern - I-81 / SR-669 (Exit 323)
Western - US-23 / US-58 Alt / SR-884 in Big Stone Gap
Eastern - I-264 / Birdneck Rd (Exit 22) in Virginia Beach
Geographic center - US-460 / VA-24 in Appomattox.
Colorado:
West: I-70 Exit 2 - Rabbit Valley
East: I-70 Exit 438 - BL I-70 and US 24
South: I-25 Exit 2 - Wootton
North: US 138 at US 385 on the northeast side of Julesburg
Most central: The geographical center of Colorado is 39°N, 105°32'48"W (https://goo.gl/maps/ouUCjM7pgQKk77iaA) which is just south of US 24 between Hartsel and Lake George. This location is 47 miles southeast of I-70 Exit 195 - CO 91 Copper Mountain, 40 miles west northwest of I-25 Exit 141 - US 24 West (which, as a crossroads interchange, could be the emotionally central interchange of the state, sorry I-70), and 37 miles west southwest of I-25 Exit 161 - CO 105 Monument.
However, the closest interchange to the center at 30.4 miles north of the center is along US 285 northeast of Bailey at Park County Road 43 and Park County Road 72 - Deer Creek.
Michigan:
Northern: I-75 and Easterday Avenue just south of the Canadian border in Sault Ste. Marie
Southern: US 23/US 223 at Stearns Road near Lambertville
Eastern: I-94/I-69 and the M-25 connector just west of the Blue Water bridge toll plaza in Port Huron
Western: I-94 and M-239 in New Baltimore
Central: US 10/US 127 and Bus. US 10/Bus. US 127 at Clare if going off the freeway network in the state. Based on the whole state, it would be I-75 and BL I-75/M-32 at Gaylord, the closest interchange to the geographic center near Elmira, based on pure latitude and longitude.
Quote from: Crown Victoria on May 29, 2021, 11:26:46 PM
Freeway-to-freeway:
North: I-86/I-90 near North East
East: US 1/US 13 near Morrisville
South: I-95/US 322 in Chester
West: I-80/I-376/PA 760 near Sharon
Central: I-99/US 322 just north of Penn State University (the I-80/I-99 interchange will be very close to challenging this when built) *I'm not counting it, but the I-99/PA 26 interchange could work here too if regarded as a very short Super-2 and not as very long ramps.
I'll do a freeway-freeway interchanges version for Ohio too
North: I-90 and OH 11
South: US 52 and OH 7. If this one doesn't count because the OH 7 freeway is incomplete and only 2 miles long, then US 52 and OH 823.
East: I-76 and I-680
West: I-74 and I-275 western interchange
Quote from: TheHighwayMan394 on May 29, 2021, 10:56:52 PM
MN:
East: I-90/US 14/US 61 (Exit 276) east split at La Crescent
South: I-35/Freeborn County 5 (Exit 2) south of Albert Lea
North and West: US 2 half-interchange with River Rd/4th St in East Grand Forks
Central: the MN 371/Business MN 371 interchange south of Baxter/Brainerd
For "just freeways":
North and east: I-35/535/US 53 in Duluth
South: I-35/90 in Albert Lea
West and central: US 10/MN 371 in Little Falls
Quote from: SkyPesos on May 30, 2021, 05:11:32 PM
Ohio
Central: I-71 and OH 13 (8.5 miles from Memorial Park in Centerburg)
Incorrect on all accounts.
According to ODOT, the geographical center of Ohio is an 1/2 north of Olive Green Rd in Porter Twp, Delaware County. (between Moody Rd & the Delaware/Knox County line)
Exit 169 for I-71 (@ Oh 13) would be 32 miles from this point (and 31 1/2 miles from Centerburg)
The correct answer for "most centered" interchange in Ohio would be I-71 @ Oh 61 (exit 141) at 7 1/3 miles from ODOT's centroid (and 11 1/2 miles from yours).
Quote from: Hot Rod Hootenanny on May 31, 2021, 12:51:34 AM
Quote from: SkyPesos on May 30, 2021, 05:11:32 PM
Ohio
Central: I-71 and OH 13 (8.5 miles from Memorial Park in Centerburg)
Incorrect on all accounts.
According to ODOT, the geographical center of Ohio is an 1/2 north of Olive Green Rd in Porter Twp, Delaware County. (between Moody Rd & the Delaware/Knox County line)
Exit 169 for I-71 (@ Oh 13) would be 32 miles from this point (and 31 1/2 miles from Centerburg)
The correct answer for "most centered" interchange in Ohio would be I-71 @ Oh 61 (exit 141) at 7 1/3 miles from ODOT's centroid (and 11 1/2 miles from yours).
I meant I-71 and OH 61 as 8 miles west of the geographic center. No idea where I got OH 13 from.
It is somewhat easier to identify Georgia's extreme and central system (freeway-to-freeway) interchanges:
Central: I-75 exit 156, I-475
South: I-516 exit 2, Veterans Parkway
East: Technically I-16 exit 166, US 17 north. One could argue that that shouldn't count because I-16 is not much more than a set of ramps east of there, in which case the answer would be the I-16 & I-516 interchange.
North and west: I-24 exit 167, I-59
The most geographically central interchange in Oklahoma is pretty easy to figure out, because, according to Google Maps, the center of Oklahoma happens to lie in the middle of Kelley Avenue in north Oklahoma City.
(https://i.imgur.com/mQwe7tP.png)
Note that I measured from the cross street here. If you instead prefer to measure from the center of all ramps, then the US-77/Kilpatrick interchange is a couple hundred feet closer.
The geographic center of Oklahoma has 4.5 stars on Google Maps, by the way.
Since CA has, well, a truly weird physical configuration, establishing extremes might be a bit of a challenge. But here we go anyway:
EAST: Virtual tie between I-8 at Winterhaven, I-10 at the east end of the Blythe business loop, and I-40 at old US 66 just west of the Colorado River (the "cutoff" to south US 95).
SOUTH: (helped by the fact that the Mexican border with Baja is slanted a bit WSW-ENE: the split of I-5 and I-805 directly north of the Tijuana border crossing.
WEST: the Fernbridge (CA 211) and/or Loleta interchanges on US 101 in Humboldt County between Fortuna and Eureka.
NORTH: This one's easy; the Hilts interchange (#796) on I-5 just south of the OR state line.
CENTRAL: The closest freeway interchange to the geographical center of the state (just calculating without extensive platting) may just be the CA 99/CA 152 interchange near Chowchilla.
Quote from: bulldog1979 on May 30, 2021, 11:51:19 PM
Michigan:
Northern: I-75 and Easterday Avenue just south of the Canadian border in Sault Ste. Marie
Southern: US 23/US 223 at Stearns Road near Lambertville
Eastern: I-94/I-69 and the M-25 connector just west of the Blue Water bridge toll plaza in Port Huron
Western: I-94 and M-239 in New Baltimore
Central: US 10/US 127 and Bus. US 10/Bus. US 127 at Clare if going off the freeway network in the state. Based on the whole state, it would be I-75 and BL I-75/M-32 at Gaylord, the closest interchange to the geographic center near Elmira, based on pure latitude and longitude.
This site is one of several I've seen
https://www.netstate.com/states/geography/mi_geography.htm#:~:text=The%20geographic%20center%20of%20Michigan,miles%20north%2Dnorthwest%20of%20Cadillac.&text=Michigan%20is%20a%20unique%20state,peninsulas%20into%20the%20Great%20Lakes.
that says that the geographic center of MI is in Wexford Co. So the center-most intersection would be one of the ones on US 131.
Washington:
North - I-5 and SR 548 (exit 276) in Blaine
South - SR 14 and SE Union Street (exit 14) in Camas - the Columbia River dips far enough south to edge out Vancouver
East - I-90 and Appleway (exit 299) near Liberty Lake
West - US 12 and Devonshire Road/Pioneer Avenue near Montesano
Central - SR 28 and SR 285 in East Wenatchee (Geographic center is apparently south of Wenatchee in the highlands)
Washington (freeways only):
North - I-5 and SR 543 in Blaine
South - I-205 and SR 14 in Vancouver
East - I-90 and SR 290 in Spokane
West - US 101 and SR 8 near Olympia
Central - US 2/97 and SR 285 near Wenatchee
Quote from: GaryV on May 31, 2021, 03:58:00 PM
Quote from: bulldog1979 on May 30, 2021, 11:51:19 PM
Michigan:
Northern: I-75 and Easterday Avenue just south of the Canadian border in Sault Ste. Marie
Southern: US 23/US 223 at Stearns Road near Lambertville
Eastern: I-94/I-69 and the M-25 connector just west of the Blue Water bridge toll plaza in Port Huron
Western: I-94 and M-239 in New Baltimore
Central: US 10/US 127 and Bus. US 10/Bus. US 127 at Clare if going off the freeway network in the state. Based on the whole state, it would be I-75 and BL I-75/M-32 at Gaylord, the closest interchange to the geographic center near Elmira, based on pure latitude and longitude.
This site is one of several I've seen
https://www.netstate.com/states/geography/mi_geography.htm#:~:text=The%20geographic%20center%20of%20Michigan,miles%20north%2Dnorthwest%20of%20Cadillac.&text=Michigan%20is%20a%20unique%20state,peninsulas%20into%20the%20Great%20Lakes.
that says that the geographic center of MI is in Wexford Co. So the center-most intersection would be one of the ones on US 131.
Yet, if you actually input the latitude and longitude given for the center point, it's by Elmira.
Ontario:
East: Highway 401 and CR-23 (https://www.google.ca/maps/@45.2024796,-74.4015383,14z)
West and probably North: Highway 17 and Hodder Avenue (https://www.google.ca/maps/@48.4827485,-89.1821731,16z)
South: Highway 401 and Highway 3 (https://www.google.ca/maps/@42.234372,-82.9872945,16z)
For Iowa
North: I-35 and County 105 west of Northwood (Exit 214)
South: I-35 and US 69 south of Lamoni at the Missouri border
West: I-29 and IA 12 in Sioux City
East: I believe US 30 and County Z36 near Low Moor is further east than I-80 and US 67 by LeClaire.
Maryland:
North: I-83 at Freeland Road in Parkton, though I-68/70/US 522 in Hancock comes close and part of I-81's Pennsylvania exit 1 is in Maryland
South: South end of the Sailsbury Bypass (US 13)
East: US 113/MD 90 in Ocean Pines
West: I-68 at MD 42 in Friendsville
Center: MD 3 at Belair Drive (with ramps to and from US 50) in Bowie
Quote from: epzik8 on June 01, 2021, 07:17:06 AM
Maryland:
East: US 113/MD 90 in Ocean Pines
You forgot MD 90/MD 589...
Kansas
West - I 70 at K267 in Kanorado.
East - 435 at State Line Road (but half of the interchange is in Missouri)
North - US 36 at US 73 in Hiawatha
South - I 35 at US 160
Central - the geographic center of Kansas is really in the boonies, but surprisingly quite near a random interchange between K4 and K156
Freeway to freeway
East - 70 at 670
North - 70 at 435
South - 35 at 135
West AND Central - 70 at 135
I just looked up the extreme points of Michigan on Wikipedia, which doesn't agree with that website. (Checking the points on a map checks out.) Michigan ranges from 46°33'58"N at the point in the border with Canada to 42°35'28"N at the IN—MI—OH tripoint in the north—south direction and 88°22'11"W at the Montreal River near Ironwood to 84°48'22"W at a corner in the Canadian border in Lake Huron in the east—west direction. Averaging each pair gives a midpoint of 45°4'43"N 86°36'6"W, which is in the middle of Lake Michigan about 20 miles WNW of Glen Haven in the Sleeping Bear Dunes, or about 5.7 miles from the maritime Wisconsin state line. It actually looks like the closest interchange to that point is going to be the northern Bus. US 41 and US 41 interchange at Peshtigo, Wisconsin! (It's 61 miles from the point in the lake, vs. 66 miles to the US 131 and M-42 interchange at Manton.)
Quote from: bulldog1979 on June 01, 2021, 09:52:17 PM
Averaging each pair gives a midpoint of...
Michigan isn't a rectangle.
The most central intersection in the Lower Peninsula is probably M-46 and US-127.
I'll go with M-55 and M-115 for the entire state.
North Carolina
Southern - US-17 / NC-130 in Shallote
Northern - US-29 / US-58 just south of Danville, VA
Western - US-74 / US-19 (Exit 64) in Bryson City
Eastern - US-17 Bypass / NC-344 (Exit 258) in Elizabeth City
Central - I-73/I-74 / NC-1002 (Exit 52) in Star
Quote from: zzcarp on May 30, 2021, 11:49:24 PM
Colorado:
West: I-70 Exit 2 - Rabbit Valley
East: I-70 Exit 438 - BL I-70 and US 24
South: I-25 Exit 2 - Wootton
North: US 138 at US 385 on the northeast side of Julesburg
Most central: The geographical center of Colorado is 39°N, 105°32'48"W (https://goo.gl/maps/ouUCjM7pgQKk77iaA) which is just south of US 24 between Hartsel and Lake George. This location is 47 miles southeast of I-70 Exit 195 - CO 91 Copper Mountain, 40 miles west northwest of I-25 Exit 141 - US 24 West (which, as a crossroads interchange, could be the emotionally central interchange of the state, sorry I-70), and 37 miles west southwest of I-25 Exit 161 - CO 105 Monument.
However, the closest interchange to the center at 30.4 miles north of the center is along US 285 northeast of Bailey at Park County Road 43 and Park County Road 72 - Deer Creek.
And then just to add to this, since I drove by the SW one Saturday that made me think of this thread.
Northwest: I-70 & CR215 in Parachute (https://www.google.com/maps/@39.449963,-108.0534102,3a,75y,49.63h,93.38t/data=!3m6!1e1!3m4!1s5d2cy1ccF5dhdUTnX_a7RQ!2e0!7i16384!8i8192)
Southwest: US160 @ Mesa Verde National Park (https://www.google.com/maps/@37.3446929,-108.4149203,3a,75y,163.29h,90.17t/data=!3m6!1e1!3m4!1sA0W0BhJs0l1h9wNO-ajqGQ!2e0!7i13312!8i6656)
Northeast: I-76 & US385 in Julesburg (https://www.google.com/maps/@40.9638846,-102.2520321,3a,75y,35.24h,84.12t/data=!3m6!1e1!3m4!1sFYuf5O7RTvyHnYwa03Xccw!2e0!7i13312!8i6656)
Southeast: US50 & US287 in Wiley (https://www.google.com/maps/@38.1159883,-102.7205565,3a,75y,83.38h,89.39t/data=!3m6!1e1!3m4!1sOW4hpCFffl44wvkDCCT3TQ!2e0!7i13312!8i6656)
Chris