Scour Critical Bridges in Michigan
1,081 bridges in Michigan at risk from water erosion around foundations.
Scour Critical Bridges
Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 1,081 bridges in Michigan have been identified as vulnerable to scour damage.
| Bridge | State | Scour Status | Condition | Year Built | ADT |
|---|---|---|---|---|---|
| CLAM RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1952 | 4,700 |
| MUSKEGON RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1934 | 4,700 |
| E BR PIGEON RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1940 | 4,658 |
| THUNDER BAY RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1927 | 4,572 |
| TITTABAWASSEE RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1900 | 4,550 |
| RYAN CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1968 | 4,542 |
| PAWLOWSKI CREEK DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1978 | 4,525 |
| ROGUE RIVER | Michigan | Scour Critical — Countermeasures Installed | Good | 1961 | 4,511 |
| BLUFF CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1962 | 4,500 |
| BLUFF CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1962 | 4,500 |
| KLACKING CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1936 | 4,423 |
| TITTABAWASSEE RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1947 | 4,422 |
| WHITE RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1970 | 4,400 |
| PINE RUN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1937 | 4,394 |
| W BR MUSKEGON RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1931 | 4,338 |
| MANISTIQUE RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1983 | 4,300 |
| RAYMPH DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1940 | 4,293 |
| FOSTORIA DRAIN | Michigan | Scour Critical — Countermeasures Installed | Poor | 1974 | 4,293 |
| EVANS CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1962 | 4,256 |
| M BR PINE RIVER | Michigan | Scour Critical — Countermeasures Installed | Poor | 1952 | 4,242 |
| SKINNER DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1978 | 4,238 |
| GRAND RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1978 | 4,238 |
| GRAND RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1978 | 4,238 |
| SKINNER DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1978 | 4,238 |
| PINE CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1932 | 4,202 |
| KALAMAZOO RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1950 | 4,200 |
| SWARTZ CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1969 | 4,200 |
| WEST BRANCH RIVER | Michigan | Scour Critical — Countermeasures Installed | Poor | 1937 | 4,184 |
| THREAD RIVER | Michigan | Scour Critical — Countermeasures Installed | Poor | 1928 | 4,097 |
| LITTLE PORTAGE CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1929 | 4,050 |
| SULLIVAN DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1987 | 3,977 |
| ST JOSEPH RIVER | Michigan | Scour Critical — Countermeasures Installed | Good | 1947 | 3,950 |
| COUNTY DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1939 | 3,942 |
| LOOKING GLASS RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1993 | 3,900 |
| SOUTH BR CHIPPEWA RIVER | Michigan | Scour Critical — Countermeasures Installed | Good | 1958 | 3,870 |
| N BRANCH BLACK RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1981 | 3,862 |
| NILE DITCH | Michigan | Scour Critical — Countermeasures Installed | Fair | 1963 | 3,862 |
| BR PINE R | Michigan | Scour Critical — Countermeasures Installed | Fair | 1947 | 3,850 |
| PINE RIVER | Michigan | Scour Critical — Countermeasures Installed | Poor | 1957 | 3,850 |
| GRAND RIVER | Michigan | Scour Critical — Countermeasures Installed | Good | 1924 | 3,815 |
| SANBORN CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1934 | 3,813 |
| BALDWIN CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1931 | 3,813 |
| MILLECOQUIN RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1940 | 3,813 |
| LAMB CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1959 | 3,741 |
| CHIPPEWA RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1961 | 3,694 |
| JONES CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1928 | 3,691 |
| MUD CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1949 | 3,660 |
| TYLER CREEK | Michigan | Scour Critical — Countermeasures Installed | Fair | 1940 | 3,652 |
| WHITMORE DRAIN | Michigan | Scour Critical — Countermeasures Installed | Fair | 1956 | 3,633 |
| MUSKEGON RIVER | Michigan | Scour Critical — Countermeasures Installed | Fair | 1977 | 3,615 |
Scour Critical Rating Codes
| Code 2 — Unaddressed | Bridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken. |
| Code 3 — Countermeasures Installed | Protective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical. |
| Code 6 — Countermeasures Ineffective | Protective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action. |
About Scour Critical Bridges
Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.