Videos

Heather Welch, Claire Rose, and Richard Coupe, U.S. Geological Survey scientists involved in the National Water Quality Assessment (NAWQA) Study of Agricultural Chemical Transport (ACT) study, outline agricultural effects on water quality in the Mississippi Delta region.

Permanent Control Site: GP1 East Transect; Depth: 7.2 Meters (23.6 Feet); Distance from river mouth: 19.0 Kilometers (11.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.11852521,-123.31538047; Site Description: This site was established as the eastern control. Depth is medium-shallow.

Permanent Control Site: GP1 West Transect; Depth: 7.6 Meters (24.9 Feet); Distance from river mouth: 19.0 Kilometers (11.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.11852521,-123.31605203; Site Description: This site was established as the eastern control. Depth is medium-shallow.

Permanent Control Site: GP2 East Transect; Depth: 12.9 Meters (42.3 Feet); Distance from river mouth: 18.8 Kilometers (11.7 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.12781102,-123.31645664; Site Description: This site was established as the eastern control. Substrate is mainly a gravel sand mixture.

Permanent Control Site: GP2 West Transect; Depth: 12.7 Meters (41.8 Feet); Distance from river mouth: 18.8 Kilometers (11.6 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.12781102,-123.31712832; Site Description: This site was established as the eastern control. Substrate is mainly a gravel/sand/cobble mixture surrounding boulders.

Permanent Site: E2 East Transect; Depth: 14.7 Meters (48.2 Feet); Distance from river mouth: 0.9 Kilometers (0.5 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15653002,-123.56130401; Site Description: This is one of our deeper sites. Video was not available in 2011 for this site pre-dam removal.

Permanent Site: E2 West Transect; Depth: 15.0 Meters (49.1 Feet); Distance from river mouth: 0.9 Kilometers (0.5 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15653002, -123.56197605; Site Description: This is one of our deeper sites. Substrate is mainly gravel/cobble with scattered boulders.

Permanent Site: H2 East Transect; Depth: 7.9 Meters (26.0 Feet); Distance from river mouth: 2.6 Kilometers (1.6 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15008216,-123.53210661; Site Description: This site is medium to shallow depth.

Permanent Site: F2 East Transect; Depth: 11.7 Meters (38.3 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15672004,-123.54969397; Site Description: Substrate is mainly gravel mixed with a little cobble and an occasional boulder.

Permanent Site: F2 West Transect; Depth: 11.6 Meters (38.2 Feet); Distance from river mouth: 1.5 Kilometers (0.9 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15672004,-123.55036603; Site Description: Substrate is mainly gravel mixed with a little cobble and an occasional boulder.

Permanent Site: A2 East Transect; Depth: 12.9 Meters (Feet 42.4); Distance from river mouth: Kilometers 1.8 (1.1 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.14130295, -123.58766124; Site Description: One of our deeper sites at over 40 feet. Sediment is primarily sand/sandy mud. Annual seaweeds are present but very sparse.

Permanent Site: C1 East Transect; Depth: 8.8 Meters (Feet 28.8); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.14525225,-123.57294101; Site Description: Substrate is entirely sand. Brown seaweeds are absent and only a few small red seaweeds remain (1:13, 2:31 seconds).

Permanent Site: H1 East Transect; Depth: 5.6 Meters (Feet 18.4); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.1479177,-123.53472865; Site Description: This is a shallow site and one of the farthest removed from the effects of the sediment plume outside of the control sites.

Permanent Site: H1 West Transect; Depth: 5.0 Meters (Feet 16.4); Distance from river mouth: 2.4 Kilometers (1.5 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.14803012,-123.53535558; Site Description: This is a shallow site and one of the farthest removed from the effects of the sediment plume outside of the control sites.

Permanent Site: C2 East Transect; Depth: 16.1 Meters (Feet 52.7); Distance from river mouth: 0.7 Kilometers (0.4 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.147841,-123.57596074; Site Description: One of our deepest sites. Substrate is now entirely all sand. Algae is almost gone. A few reds are seen at 0:48, 1:04, 1:49 seconds.

Permanent Site: F1 East Transect; Depth: 6.2 Meters (20.4 Feet); Distance from river mouth: 1.3 Kilometers (0.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15292999, -123.55011402; Site Description: This is a shallow site with gravel/cobble substrate.

Permanent Site: F1 West Transect; Depth: 9.7 Meters (32 Feet); Distance from river mouth: 1.3 Kilometers (0.8 Miles) east; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15292999, -123.55078602; Site Description: This is a shallow site with gravel/cobble substrate and an occasional boulder.

Permanent Site: C2 West Transect; Depth: 17 Meters (Feet 55.7); Distance from river mouth: 0.7 Kilometers (0.5 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.147841,-123.57663268; Site Description: One of our deepest sites. Substrate is now entirely all sand. Algae is almost gone.

Permanent Site: A1 East Transect; Depth: 8.4 Meters (27.5 Feet); Distance from river mouth: 1.8 Kilometers (1.1 Miles) West; Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.13870775, -123.5855312; Site Description: Transect is in eastern part of Freshwater Bay. Sediment is primarily sand/sandy mud with an occasional boulder. Seaweeds are sparse.

Permanent Site: D1 East Transect; Depth: 10.0 Meters (32.8 Feet); Distance from river mouth: 0.2 Kilometers (0.1 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15115998,-123.56734404; Site Description: This site is right off the mouth of the river. Substrate is still mainly gravel with some sand. All annual species of seaweeds are gone.

Permanent Site: D1 West Transect; Depth: 10.3 Meters (33.8 Feet); Distance from river mouth: 0.2 Kilometers (0.1 Miles); Pre/Post Dam Removal: 10 months post-dam removal; Lat/Long: 48.15115998,-123.56801602; Site Description: This site is right off the mouth of the river. Substrate is mainly gravel with some sand.