River Chart - Legend
| Coords | Page number and coordinates in (appropriate state) DeLorme's Atlas & Gazetteer. |
| Ref.City/Dir. | Reference City (nearest "significant" city) / Direction from that city |
| Dist | Distance from Reference City. |
| River | River name, and segment designation (where needed) |
| Lgth | Length of normal run |
| Class | Whitewater rating using standard scale of I to VI. Also, subjective designates of PD=Pool Drop, LD=Lake Drop (like pool drop, but l-o-n-g pools!), CT=Continuous Technical, BS=Big Slides, PnP=Park and Play |
| Grd.A | Average Gradient (feet per mile) Note: Other sources may cite gradient figures at variance with those cited herein. Differences may be introduced depending upon source of data, differences in access points used (length of reach), method of calculation, and attention to detail. Gradient figures should only be used as a general indicator of the nature of the run. Differences of 10-20 feet per mile (or more, at higher gradients) are not uncommon, and should not be viewed as 'significant'. |
| Grd.M | Maximum Gradient (feet per mile) |
| Grd.H | Maximum Gradient in any Half mile stretch (feet per mile) |
| Low | Recommended minimum level for boatability. May be boatable lower, depending on your preferences. May be stated as gauge reading (CFS=cubic feet per second), stage reading (feet or inches), or boaters gauge. Often boaters gauge is 'measure down', in which case readings are 'negative', and will be enclosed in parenthesis to so indicate. |
| Opt | Recommended optimum level for boatability. (Obviously subjective.) Levels near this value are what the descriptions are based upon. Difficulty, features, and playability will change at lower and higher water levels. |
| High | General nature and difficulty of section increases around and above this level. This is not a maximum, but may indicate 'flood-like' levels. Always use utmost caution boating rivers in flood conditions. |
| 10% | Historical records (U.S.G.S.) flow rate (CFS=cubic feet per second) which is exceeded 10% of the time. (Can often serve as an indicator of how likely/frequently the river is boatable.) |
| Max | Historical records (U.S.G.S.) maximum daily mean flow rate (CFS=cubic feet per second). |
| 10/90 | A simple number, with no 'units', derived by dividing the 10% exceedence flow by the 90% exceedence flow. This ratio acts as a measure of how steady or 'flashy' the river is.. A low '10/90 ratio' (E.G., 3 or less) indicates fairly stable, consistent flow. A high '10/90 ratio' (E.G., 10 or higher) indicates a 'flashy' river, with wide variation and highly 'seasonal' flow. |