Figure 1. Treeline width of main channel of nontidal reach of Apalachicola River, Florida, in 1941 and 

2004. Widths were measured at approximately 2,800 points at 164-foot intervals along the channel 

centerline in aerial photographs. Data shows a 2-mile (64-point) moving average. River miles represent 

those depicted on the most recent USGS quadrangle maps available in 2005. 

200

300

400

500

600

700

800

900

1000

1100

110 100 90 80 70 60 50 40 30 20

River mile

Treeline width, in feet

1941

2004 PROVISIONAL DATA

2-mile moving average

UPPER

1941 mean: 708 ft

2004 mean: 761ft

MIDDLE

1941 mean: 596 ft

2004 mean: 689 ft

NONTIDAL 

LOWER

1941 mean: 390 ft

2004 mean: 473 ft
Change in treeline width from 1941 to 2004, in feet 

Figure 2. Change in treeline width of main channel of nontidal reach of Apalachicola River, Florida, from 1941 to 

2004. Widths were measured at approximately 2,800 points at 164-foot intervals along channel centerline in 

aerial photographs. Data shows a 2-mile (64-point) moving average. River miles represent those depicted on the 

most recent USGS quadrangle maps available in 2005.

-200

-150

-100

-50

0

50

100

150

200

250

300

350

400

110 100 90 80 70 60 50 40 30 20

River mile

2-mile moving average

UPPER MIDDLE NONTIDAL

LOWER

RM 35 to 40 average

51% (171 ft) wider RM 69 to 77 average

21% (143 ft) wider

Entire nontidal 

river average

13% (77 ft) wider

No change

PROVISIONAL DATA
Figure 3.--Mean treeline width of main channel of nontidal reach of Apalachicola River, 

Florida, in relation to time. Measurements were made on aerial photographs along the 

river centerline at approximately 2,800 points equally spaced at 164-foot intervals. 

350

400

450

500

550

600

650

700

750

800

850

1930 1940 1950 1960 1970 1980 1990 2000 2010

Year

Treeline width, in feet

Upper reach

Middle reach

Entire nontidal river

Nontidal lower reach

PROVISIONAL DATA
Figure 4. Mean bed elevation of low-flow channel of the nontidal Apalachicola River, Florida, in 1960 and 2001. 

Data was derived from U.S. Army Corps of Engineers cross-sections surveys. At each cross-section, the watersurface elevation at a lagged discharge of 10,000 cubic feet per second at the Apalachicola River gage at 

Chattahoochee, Florida, was used to calculate mean bed elevation. River miles represent those depicted on the 

most recent USGS quadrangle maps available in 2005. 

-15

-10

-5

0

5

10

15

20

25

30

35

40

110 100 90 80 70 60 50 40 30 20

River mile

Mean bed elevation, in feet above mean sea level

1960

2001

UPPER

MIDDLE

NONTIDAL 

LOWER

PROVISIONAL DATA
Change in mean bed elevation from 1960 to 2001, in feet 

Figure 5.--Change in mean bed elevation of low-flow channel of the non-tidal Apalachicola River, Florida, from 1960 

to 2001. Data was derived from U.S. Army Corps of Engineers cross-sections surveys. At each cross-section, the 

water-surface elevation at a lagged flow of 10,000 cubic feet per second at the Apalachicola River gage at 

Chattahoochee, Florida, was used to calculate mean bed elevation. River miles represent those depicted on the 

most recent USGS quadrangle maps available in 2005. 

-10

-8

-6

-4

-2

0

2

4

6

8

10

110 100 90 80 70 60 50 40 30 20

River mile

UPPER MIDDLE

NONTIDAL 

LOWER

No 

change

PROVISIONAL DATA