Mont. Code Ann. § 85-1-304

All moneys received from any bonds issued pursuant to 85-1-301 and 85-1-303 shall be applied solely to the payment of the cost of the works or to the appurtenant debt service fund and to the "administration fund", as hereinafter provided, and there shall be and hereby is created and granted a lien upon such moneys, until so applied, in favor of the holders of the bonds or the trustee hereinafter provided for in respect of such bonds.