This reservoir doesn't show up on any aerial imagery or any of the street-level images of the area, and it's not on the Spokane Water Department's list of facilities. Thus, I'm forced to conclude that it doesn't exist, and is merely an attempt at attracting Pokemon.

Welcome to OSM!

When you're adding something to the map, it's important to tag what sort of thing it is. Giving a basketball court a name describing it as such only helps people searching by name, while adding the "Basketball Court" tag lets people search by type, or do things like make a map highlighting every basketball court in the area.

You can also change the background imagery shown in the editor: it's the "Background Settings" button on the right (the one that looks sort of like three stacked sheets of paper). In the Spokane area, the "Esri World Imagery" option is the sharpest imagery available, and it's good enough that you can tell there was a 3v3 basketball game going on when the aerial photo of the park was taken.

Some have, some haven't.

I suspect there's a fair bit of wishful thinking in this planned alignment. You'd need to build at least one large bridge and dig some significant cuts to actually fit it into the landscape.

Simply giving a point a name isn't much use. It's much better to say what sort of thing it is. In the case of a trailhead, the most common choice is to tag it as a parking lot, but there's also a "trailhead" tag that occasionally gets used.

A quick tip: if you're editing in the Spokane County area, "Esri World Imagery" is far sharper than the default Bing background imagery. You can change which imagery you're using by clicking on the "Background settings" button in the editor (the one that looks sort of like three stacked sheets of paper).

I'm used to the Idaho Panhandle Forests, where forest service roads often have both a name ("Trestle Creek Road") and a number ("275"), and signs might use either (or occasionally both). If you don't think it's signed "Big Foot" anywhere, then removing the name is fine with me.

I try to keep an eye on everything in the Eastern Washington/Northern Idaho/Western Montana area. This is right at the southeastern corner of what I watch. I'm busy catching up on the backlog from being on vacation for a week.

The Census Bureau seems to think it's called "Big Foot". No idea if they're right or not -- they've got a habit of being wrong in rural areas.

The building looks decidedly apartment-like, the website is a GoDaddy landing page, and a Google search for "Baker Law Office" shows a number of addresses that are decidedly closer to downtown. Are you sure you mapped this correctly?

Please do your stuff in smaller areas at a time. It makes it easier to find mistakes, such as how you moved a fire hydrant in Los Altos, California, into the middle of the street.

Please also be more descriptive with your changeset comments. I'm assuming that moving the fire hydrant was a mistake, because fire hydrants in the United States are not normally found in the middle of the street. A better comment (eg. "Improved building alignment") would make it clear that moving the fire hydrant was unintended.

When you're editing a roundabout, make sure you don't connect an entrance road directly to an exit road. That creates a "short circuit" and causes routing software to give incorrect instructions.

For example, with the "4th Avenue" entrance connected directly to the "West Marie Street" exit, a router will ignore the roundabout entirely; the curve is gentle enough that it might not give any instructions at all. With the two separated, it will give instructions such as "take the first exit from the roundabout".

I've deleted Creedonia.

Don't add fictional things to the map -- it's a good way to get yourself blocked. If you want to create a fictional country, OpenGeoFiction.net is a project that lets you do so.

About a third of the buildings you added had "building=yes" on their nodes as well as on the way. I've fixed it, but you might want to re-evaluate whatever your workflow is to keep it from happening in the future.

I've reduced many of the trails to T1 or T2 based on my (sometimes rather hazy) memory. I've left Paintbrush Canyon at T3 because I've never hiked it, and in the aerial imagery, parts of the upper reaches look like they might be a bit tricky.

Zero lanes on the freeway off-ramp? That doesn't seem correct to me.

The place was named by French fur traders in the 1700s -- you can probably find at least as many French spellings as there were traders.

"Dock" is for drydocks and similar ship-repair facilities. The tag you're looking for is "Pier", and the editor won't let you put it on points, only on lines and areas.

As far as I can tell, the original city line was correct: the Spokane city limits run down the west side of Havana, the Spokane Valley city limits run down the east side, and Havana itself is in the county.

You might want to work on your aim. A number of the crossings you've added recently have been close to, but not actually on, the point where a pedestrian way intersects the road.

When you're editing in Spokane County, Esri World Imagery is far sharper and better-aligned than the other options, and is nearly as new as Bing or DigitalGlobe Standard.