# Presentation: 571647

**Referencing and Analyzing Dams**
**with the National Hydrography Dataset**
**Jeff Simley, U.S. Geological Survey**
**Bill Smith, U.S. Geological Survey**

## Slide 2

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## Dam

**Dam**

**Network upstream**
**of dam blocked**
**by dam**

**Upstream**
**navigation**
**start **

**Red: Everything**
**upstream **

## Slide 4

**Notes:**
In Michigan there is great interest in the potential migration paths of Sea Lamprey.  Theoretically, the Sea Lamprey cannot migrate upstream beyond a dam.  Knowing the location of all the dams on the network makes it easy to determine what part of the network is susceptible and not susceptible to migration.  This prototype shows waters in red that theoretically are susceptible to Sea Lamprey.

## 90 ft.

**90 ft**.

**NID dam location**

**Edited dam location**

**Indexed dam location**

**Lake**

**Dam address:**
**Reach: 14010001002651**
**Measure: 99.929218**

## NID dam location

**NID dam location**
**is reasonable**

**Notes:**
NID dam location

## Correct location

**Correct location**
**for purposes of the NHD**

**Notes:**
NID dam moved to more ideal location on the NHD

## Look at dam name and river

**Look at dam name and river**
**name to determine where the **
**dam belongs**

**NID location**

**Notes:**
Not sure where dam goes.  Identify NID.  Name: Lily Pond

## Look at NHD name and flow

**Look at NHD name and flow**

**Notes:**
Identify most likely lake.  Name Lily Lake.

## Moved dam here to get proper

**Moved dam here to get proper**
**indexing result**

**Notes:**
Moved dam to more likely location.

## NID Dam

**NID Dam**
**location**

**Assumed correct**
**dam location**

## NID location

**NID location**

**Assumed location**

**Use name to aide decision**

## Easily made assumption

**Easily made assumption**
**of correct dam location**
**based on graphics**
**Use name to confirm**

**Notes:**
No brainer example.

## Assume location simply by stream name

**Assume location simply by stream name**

**Assume location at nearest spot with **
**only stream name for guidance**

**Notes:**
Example of dam on creek.  Guess location simply on name.

## No evidence of a dam

**No evidence of a dam**

## No evidence of a dam

**No evidence of a dam**

## No evidence of dam

**No evidence of dam**

## No evidence of dam

**No evidence of dam**

## Non-indexable

**Non-indexable**
**Dam location**

**Notes:**
Have no idea where this goes.  Will skip over this.

## NID dam right on stream

**NID dam right on stream**
**looks like a hit, but**
**no evidence of a dam**
**in imagery**

## Three NID dams with

**Three NID dams with**
**no evidence in imagery**

## Assume dam belongs

**Assume dam belongs**
**on lake**

**NID location**

**Indexed location**

**Lake**

## NID location almost right

**NID location almost right**
**on stream, but no evidence **
**dam, except possibly**
**nearby lakes**

## Dam

**Dam**

**NID location**

## Dam and lake not connected to NHD network

**Dam and lake not connected to NHD network**

**No point in indexing this, but may **
**want to improve location of dam**

## Can’t find the lake this

**Can’t find the lake this**
**dam belongs to**

**Notes:**
Can’t find a Jefferson Lake.  Will have to skip.

## Make assumption of

**Make assumption of**
**dam location based**
**on name and graphics**

**Notes:**
No brainer situation.  Simply move the dam.

## Actually have dam in NHD to

**Actually have dam in NHD to**
**confirm location**

**Notes:**
Here you can actually see the dam.

## Not enough information in location or stream name to 

- Not enough information in location or stream name to
- Make decision

**Not enough information in location or stream**
**name to make decision on correct location**

**Notes:**
Not enough information to make a decision.  Neither creek is named.

## Dam near wrong flowline for

**Dam near wrong flowline for**
**proper position**

**Notes:**
Dam near wrong flowline.

## Dam has two outlets

**Dam has two outlets**
**in NHD**

**Dam has two outlets**
**in NHD**

## Dam has two outlets

**Dam has two outlets**
**in NHD**

## Dam has two

**Dam has two**
**outlets on map,**
**but only one in **
**NHD**

## Two streams impounded

**Two streams impounded**
**by one dam**

## Two NID dams

**Two NID dams**
**Two NHD flowlines**
**Unclear what second dam does**

## Question of where exactly

**Question of where exactly**
**to index dams**

## Lake has two outlets

**Lake has two outlets**

**Notes:**
A two outlet example.

## Create dummy dam

**Create dummy dam**

**Move NID dam**

**Notes:**
Solution: Create dummy dam.

## Moved dam

**Moved dam**
**and indexed**

**Created dummy**
**dam and indexed**

## Use flow direction to determine

**Use flow direction to determine**
**dam location at just one**
**outlet point**

**Notes:**
Dam in middle of lake.  Need to find outlet to place dam in correct location.  Use flow as a guideline.

## Two outlets, but only one dam

**Two outlets, but only one dam**

## Two dams represented by one NID dam

**Two dams represented by one NID dam**

## Corrected dam location

**Corrected dam location**

**Dummy dam**

**Non-indexable dam**

**Notes:**
Study area.  Black squares are dams with corrected location.  Green circle is dummy dam.  Purple pentagon in non indexible dam.

## Indexing results with 50 ft tolerance

**Indexing results with 50 ft tolerance**
**All but non-connected dams have indexed**

**Notes:**
Indexed with 50 feet buffer.  Green dots are indexed dams.  Note dams not intended to index did not index.

## Properly indexed dams

**Properly indexed dams**

**Notes:**
Properly indexed dams.

## Dams on Colorado River system

**Dams on Colorado River system**
**upstream of Blue River confluence**

**Notes:**
Selected dams upstream of navigation point.

## Colorado River system dams with

**Colorado River system dams with**
**normal storage of over 1,000**
**acre-feet**

**Notes:**
Select dams with storage over 1,000 acre feet.

## Dams upstream of Blue River

**Dams upstream of Blue River**
**confluence with normal storage**
**over 2,000 acre-feet**

**Notes:**
Dams upstream of Blue River Confluence with normal storage more than 2,000 acre-feet.

## Dams upstream of Blue River confluence

**Dams upstream of Blue River confluence**
**Built before 1960**

**Notes:**
Dams upstream of Blue River confluence built before 1960.