Resources Matrix Riprap (partially grouted riprap) Matrix Riprap Installation Guidance (YouTube) Matrix Riprap Summary Sheet (PDF) Geobag Summary Sheet (PDF) Geobag Construction Special Provision (Word) Select a Multiple Box Culvert or Bridge Structure Culvert versus Bridge selection help (PDF) Fish Passage - AOP Minnesota Guide for Stream Connectivity and Aquatic Organism Passage Through Culvert (PDF) NCHRP 24-40 Stream Stability at Crossing Workshop NCHRP Final Research Report 853
