| State | Uses ESS | Number of ESS | ESS Owned By | ESS Operated By | ESS Maintained By |
|---|
| Alabama | No | 0 | | | |
| Alaska | Yes | 24 | State DOT | State DOT | State DOT |
| Arizona | Yes | 14 | State DOT | State DOT | State DOT |
| Arkansas | No | 0 | | | |
| California | Yes | 81 | State DOT | State DOT | State DOT |
| Colorado | Yes | 80 | State DOT, and We own 80 at CDOT and the cities and counties account for approximately another 40 or so. All data comes into our servers and the counties view them through out ITS website WWW.cotrip.org | State DOT, and All RWIS equipment comes thru 6 regional servers which are provided by a proprietary vendor. We operate/maintain the servers and the RWIS we own. The cities and counties operate/maintian the RWIS they own | State DOT, and CDOT with the help of private contractors maintains both servers and RWIS in the field |
| Connecticut | Yes | 6 | State DOT | State DOT | State DOT |
| Delaware | Yes | N/R* | N/R* | N/R* | N/R* |
| Florida | Yes | 30 | State DOT | State DOT and other public or private agencies | State DOT and other public or private agencies |
| Georgia | Yes | 47 | State DOT | State DOT | State DOT |
| Hawaii | No | 0 | | | |
| Idaho | Yes | 30 | State DOT, and too numerous to list. | State DOT, and ditto | State DOT, and ditto |
| Illinois | N/R* | N/R* | N/R* | N/R* | N/R* |
| Indiana | Yes | 31 | State DOT, and City of Indianapolis | State DOT, and City of Indianapolis | State DOT, and City of Indianapolis |
| Iowa | Yes | 53 | State DOT | State DOT | State DOT |
| Kansas | Yes | 43 | State DOT, and 42 KDOT-owned, 1 county owned | State DOT | State DOT, and County maintains its own, we maintain our own |
| Kentucky | Yes | 7 | State DOT | State DOT | State DOT |
| Louisiana | Yes | 3 | State DOT | State DOT | State DOT |
| Maine | Yes | 5 | State DOT | State DOT | State DOT |
| Maryland | Yes | 60 | State DOT, and Other state and county agencies | State DOT | State DOT, and Local and Manufacture |
| Massachusetts | Yes | 11 | State DOT | State DOT | State DOT |
| Michigan | No | 0 | | | |
| Minnesota | Yes | 93 | State DOT and other public or private agencies | State DOT, and Mn/DOT operates all ESS located in Minnesota. Information recieved from surrounding states is from systems they own/maintain. | State DOT, and Again, Mn/DOT maintains all of our state's ESS sites, but out of state info we access is owned and maintained by the state we recieve it from. |
| Mississippi | N/R* | N/R* | N/R* | N/R* | N/R* |
| Missouri | Yes | 15 | State DOT, and Boone County | State DOT | State DOT |
| Montana | Yes | 60 | State DOT | State DOT | State DOT |
| Nebraska | Yes | 45 | State DOT, and Various public sources such as airports, NWS, etc. RWIS vendor owns some. DOR owns others. | State DOT | State DOT and other public or private agencies |
| Nevada | Yes | 54 | State DOT | State DOT | State DOT |
| New Hampshire | Yes | 4 | State DOT | State DOT | State DOT, and Vaisala, Contractor for installation and service |
| New Jersey | No | 0 | | | |
| New Mexico | No | 0 | | | |
| New York | No | 0 | | | |
| North Carolina | No | 0 | | | |
| North Dakota | Yes | 19 | State DOT | State DOT | State DOT |
| Ohio | Yes | 158 | State DOT | State DOT | State DOT |
| Oklahoma | No | 0 | | | |
| Oregon | Yes | 55 | State DOT | State DOT | State DOT |
| Pennsylvania | Yes | 4 | State DOT | State DOT | State DOT |
| Rhode Island | Yes | 8 | State DOT | State DOT | State DOT |
| South Carolina | Yes | 19 | State DOT | State DOT | State DOT |
| South Dakota | Yes | 40 | State DOT | State DOT, and City of Sioux Falls, SD | State DOT, and City of Sioux Falls, SD |
| Tennessee | Yes | 37 | State DOT | State DOT | State DOT |
| Texas | No | 0 | | | |
| Utah | Yes | 41 | State DOT | State DOT | State DOT |
| Vermont | No | 0 | | | |
| Virginia | Yes | 66 | State DOT, and 2 separate Counties containing 3 stations of the 66. | State DOT | State DOT |
| Washington State | Yes | 76 | State DOT, and WSDOT (66), City of Spokane(2), Spokane Internationl Airport (3), Yakima County (5) | State DOT, and Each agency operates their own ESS. All operate through WSDOT's RWIS server system. | State DOT, and Each agency maintains its own ESS. |
| West Virginia | No | 0 | | | |
| Wisconsin | Yes | 60 | State DOT | State DOT | State DOT |
| Wyoming | Yes | 28 | State DOT | State DOT | N/R* |
| 50 States * N/R = No response |
Using Environmental Sensor Stations (ESS) that are Components of a State DOT Road Weather Information System (RWIS)