List of Figures 
Figure 2.1. Location map of Yaquina Estuary. 6 
Figure 2.2 Map of watershed of the Yaquina Estuary, showing the two primary tributaries.7 
Figure 2.3 Monthly discharge statistics (Yaquina River + Big Elk Creek). 8 
Figure 2.4 a) False-color, infrared aerial photography mosaic of Yaquina Estuary and 
b) map of intertidal seagrass and macroalgae in Yaquina Estuary.12 
Figure 2.5 Populations in the cities of Toledo and Newport, Oregon from 1890 to 2005. 14 
Figure 2.6 Number of logs floated or rafted on the Yaquina River from 1918 to 1978. 16 
Figure 2.7 Conceptual model of factors influencing nutrient and response variables in the 
Yaquina Estuary.19 
Figure 3.1 Modeled contribution of WWTF effluent, riverine, and oceanic sources to DIN at 
5 locations in the estuary during January - September of 2004.25 
Figure 5.1 Salinity versus distance from mouth of the estuary during the a) dry and 
b) wet seasons.34 
Figure 5.2 Spatial variation in dry season NO 3 + NO 2 .36 
3 - 
Figure 5.3 Spatial variation in dry season PO 4 .36 
Figure 5.4 Dry season chlorophyll a versus salinity (all stations from 1974-2006).38 
Figure 5.5 Mean dry season (2006) total nitrogen (TN) and total phosphorous (TP) versus 
distance from mouth of estuary.41 
Figure 5.6 Mean dry season (2006) chlorophyll a versus distance from mouth of estuary.41 
Figure 5.7 Total nitrogen (TN) versus chlorophyll a for the dry season (2006) with data 
divided by zones.42 
Figure 5.8 Total phosphorous (TP) versus chlorophyll a during the dry season (2006) with 
data divided by zones.42 
Figure 6.1 Comparison of historic and recent NO 3 +N0 2 during the dry season in a) Zone 1 
and b) Zone 2.46 
Figure 6.2 Comparison of historic and recent N0 3 +N0 2 during the wet season in a) Zone 1 
and b) Zone 2.46 
IX 
