Contour map · Illinois
Illinois River – Alton Pool
28 ftdeepest spot
9,088acres
5 ftcontour lines
What you get on Illinois River – Alton Pool
- Every drop-off on a full contour map, lines every 5 ft, from the USGS / USACE survey.
- Drop a pin anywhere and see the depth under it.
- Riggs tells you where to fish and what to throw today, from the weather, water temp, likely species and the odds.
- Follow My Boat (Pro) shows the depth under your boat as you move.
Free to download. A free pick every day; contour maps with Pro or Guide.
Illinois River – Alton Pool at a glance
| Location | Illinois |
|---|---|
| Size | 9,088 acres |
| Deepest spot | 28 ft |
| Contour lines | every 5 ft |
| Survey | USGS / USACE |
Boat ramps and marinas on Illinois River – Alton Pool
18 boat ramps: Bedford Ldg Access, Griggsville Ldg Access, Hadleys Ldg, Hardin, Illinois River, Kampsville, Lower Stump Lake, Marquette Park and 5 more.
In the app, every one is on the map, next to the contour lines.
Ramp and marina locations © OpenStreetMap contributors (ODbL).
Lakes near Illinois River – Alton Pool
- Mississippi River Pool 2520 mi
- Greenfield Lake21 mi
- Mississippi River Pool 2427 mi
- Otter Lake South36 mi
- Otter Lake North36 mi
- Siloam Springs Lake36 mi
Contour map: USGS / USACE. Rigology shows the agency's survey and is not affiliated with it.