The weekly average yield to maturity of the Bond Buyer Municipal Bond Index, which is based on 40 long-term bond prices, was down eight basis points this past week, to 4.53 for the week ending May 15.
The 20-Bond GO Index of 20-year general obligation yields fell five basis points to 4.26%, the lowest since June 6.
The 11-Bond GO Index of higher-grade 20-year GO yield also slipped two basis points to 4.01%, the lowest since June 13.
The Bond Buyer's Revenue Bond Index, which measures 30-year revenue bond yields, dropped 16 basis point this week, to 4.81%, the lowest since June 20.
The yield on the U.S. Treasury's 10-year note fell 12 basis points to 2.50%, after remaining unchanged from the prior week.
The yield on the Treasury's 30-year bond edged up 11 basis points to 3.33%, after gaining 10 basis points the week before.
