| 42.7 |
This is the RECORD FLOOD LEVEL that was reached on August 1 1993. |
| 40.0 |
Railroad tracks from Wood River to Alton begin to flood. |
| 38.6 |
Flood waters reach the low steel on RR bridge swing span in Alton. |
| 37.6 |
Damage begins to Miller Milling Company in Alton |
| 35.0 |
Burlington Northern RR floods from West Alton, Missouri to Alton, Illinois. |
| 34.0 |
Major damage level. Commercial damages begin in Alton. |
| 33.0 |
Urban flood damage begins in Elsah, Illinois and Portage des Sioux. |
| 32.9 |
Riverfront Park in Alton begins flooding. |
| 31.5 |
Commercial basements in Alton begin to flood. |
| 30.5 |
Bloch Marine Service at the Harbor Point Yacht Club begins flooding near this level. |
| 29.9 |
Route 100 at Alton closes. Also at this level the north and south Wood River Levee structures are closed. |
| 29.5 |
Urban flood damage begins in Peruque. |
| 29.3 |
The North Wood River Levee must be closed at this level. |
| 29.0 |
Moderate flooding begins. |
| 28.5 |
The South Wood River Levee must be closed at this level. |
| 26.5 |
Yachtview Drive floods along the entrance to Harbor Point Yacht Club. |
| 25.5 |
Highway 94 begins flooding just north of West Alton. |
| 25.0 |
Harbor Point Road off of Highway 94 north of West Alton begins flooding on the east end of the road. |
| 24.0 |
Alta Villa Road off of Highway 94 north of West Alton begins flooding. |
| 23.0 |
Dresser Island Drive floods at this level. |
| 21.0 |
Flood Stage. Minor flooding begins to occur at this level. |
| 20.8 |
Unprotected farm land begins to flood |
weather.gov 
