This Tri-State Monument is close to our hometown of Springfield, Missouri. This trip we were heading out west for several weeks. Neither one of us have actually visited this monument before. So on October27th of 2023 was our first official visit. We took I-44 west of Springfield, MO to exit 1 where hwy 400 and hwy 166 turn north. We followed it 0.37 miles to the roundabout and took the 3rd exit onto Downstream Boulevard and went west for 0.12 miles to Southeast 118th street. Then we turned south on Southeast 118th street and went 0.21 miles to the monument.

As described by the NGS Data Sheet:

THE BOUNDRY MONUMENT IS MADE OF ROCK WITH A ROUND CONCRETE TOP.
 GG0683'IT HAS A BRASS PLATE ON THE SOUTH SIDE WITH THE INSCRIPTION
 GG0683'OKLAHOMA 1907 AND A BRASS PLATE ON THE NORTH SIDE WITH THE
 GG0683'INSCRIPTION KANSAS 18 STATE CORNERS 50 FEET EAST OF CENTER OF
 GG0683'MONUMENT.  THE POINT HELD BY THIS PARTY WAS THE CENTER OF
 GG0683'THE CONCRETE TOP OF THE MONUMENT.

Visited on October 27th 2023