The rating for Lower Matecumbe, Upper Matecumbe, and Windley Key are all ranked a “D.”  Plantation Key has improved to a “C” in 2025, primarily because the construction related to the pipeline installation lowered the speed limit to 35 MPH.    

In Monroe County, once a segment falls below a “C” no more construction can occur unless there is appropriate mitigation to reduce the deficiencies in that segment.  Unlike the County, Islamorada does not stop construction when a segment is deficient.  

If the overall Level of Service (LOS) for the entire 114 miles of US 1 falls below the LOS C Standard, then no additional land development will be allowed in the Florida Keys, unless mitigation measures are proposed to address the LOS deficiencies.

In 2019 and 2023 the overall LOS fell below the LOS C but the County simply did not approve the study so continued development was allowed.  

4-Laning U.S. One, also on the Sep 10 County agenda

The Islamorada Community Alliance has joined nearly 2 dozen organizations throughout the Keys, objecting to this possible 4-laning.  Click here to read the details as to the concerns.

Can you imagine converting Islamorada’s “Main Street” into a major 4-lane highway aimed at getting more folks through our community to points south.

The proposal to allow 4-laning the highway and to accept the 2025 US 1 Level of Service Study are to be heard back to back by the County Commission in Key Largo, Murray Nelson Government Center, beginning at 1:30 pm Sep 10.