Standard & Poor's Ratings Services said it raised its rating to AA-plus from AA on Kalamazoo, Mich.'s outstanding limited-tax general obligation Michigan Transportation Fund (MTF) bonds.
The outlook is stable.
"The upgrade is based on very strong debt service coverage," said Standard & Poor's credit analyst Blake Yocom.
The rating reflects the stronger pledge of MTF revenues and is rated under Standard & Poor's special tax bonds criteria.